Godzilla - Pretty much nothing. I like it as is.
Godzilla Raids Again - I always felt like killing Anguirus at the middle portion of the movie kind of killed the momentum for the 2nd half. Why put the explosive and wild city destroying monster battle at the middle portion of the film? That should be the ending, right?
King Kong Vs. Godzilla - Can we design a better Kong suit please? lol. Aside from that, the (deliberate) comedic tone and satirical take does generate some laughs, but I would have liked a tone closer to what we got in Mothra Vs. Godzilla. That would have felt more appropriate for an occasion as big as this.
Mothra Vs. Godzilla - If you asked me at age 5, I would have said "Make Godzilla win!" lol. Now though? Its fine as is.
Ghidorah the Three Headed Monster - It would have been nice to see Ghidorah as more of a global threat, like he was built up to be. I know these movies take place in Japan, but it would have been neat to see Ghidorah tear up other countries and other cities before making his way to Japan, where Godzilla, Rodan, and Mothra are waiting as the last line of defense. Its a minor change, but one that makes Ghidorah a little bit more threatening.
Godzilla Vs. Monster Zero - Very entertaining film, but the writing could have used a touch up. The biggest issue for me is how the Planet X aliens execute their plan. Why go to the trouble of tricking humanity into allowing them to take Godzilla and Rodan when it appears that they could have just easily taken them when ever they wanted? I mean even if humanity interfered, could they have really done anything to stop them? Maybe they could have written it in a way where the X-aliens needed to play nice in order to find out where Godzilla and Rodan were located, so there'd be some value in them having to lie to the Earth.
Godzilla Vs. The Sea Monster - Odd thing to say, but I really think this movie would be better if Godzilla wasn't in it. Once he wakes up, The Red Bamboo and Ebirah no longer seem like as big of a threat. Godzilla is the greatest sea monster of all time, so a giant lobster isn't going to be too much of a challenge for him, and the Red Bamboo isn't going to stand up to him either. Had it been Kong like originally planned, at the very least, a sea monster would present a unique challenge for a land monster like Kong. The island setting and scenes of him bashing planes and hitting on the pretty native girl would have been more in Kong's wheel house anyway. And if Kong wasn't in it, this might have worked as a stand alone Mothra film as well, with Mothra taking revenge for her people being abducted, a call back to the original Mothra film. Although Ebirah wouldn't challenge her all that much as she could just fly over him, but hey.
Son of Godzilla - Can we please design Minilla in a way so that he actually looks like a baby Godzilla? I'll never understand the Doughboy look they went with, lol.
Destroy All Monsters - All the monsters got their moments to shine...except Baragon and Varan. It would have been nice to see them get something, even if it was just a quick moment. To have Baragon as a guard dog guarding the Kilaak base might have been nice, and using him to destroy the Arc De Triumph (as originally scripted) would have made more sense given his abilities (too bad about the suit). And with Varan we could have at least had shots of him taking down planes and jets or something, right?
As for other monsters, the big ones that got left out were King Kong and The Gargantuas. I'll take Kong out of the equation since there is a whole right's issue there, but the Gargantuas would have been cool to have. Granted, that was also impossible as Haruo Nakajima is Godzilla and was VITAL to making Gaira work, and he can't play both (if they are going to share screen time anyway) but still, it would have been nice to see.
Finally, I always felt like the finale with The Fire Dragon was a bit of a tacked on climax. I feel like the Kilaak threat was eliminated, Ghidorah was killed, the monsters were freed....we're pretty much done here, but then they tack on the Fire Dragon as a last minute climax. Maybe it could have worked if the Monsters had saved the SY-3 (say Rodan takes a retaliatory shot at it and opens up the SY-3 to shoot it down) , signifying some kind of a union between man and monster, but as is, it feels tacked on.
Godzilla's Revenge - Don't use stock footage. I actually kind of like the "Godzilla in Wonderland" kind of idea here with the whole thing being a dream/imaginary voyage and they could have done so many weird and wacky things with it. I mean, what would a 10 year old kid come up with dreaming about visiting Godzilla's home? I gotta tell ya, I wouldn't have envisioned watching his same old battles over and over again. There is some imaginative areas to go with here, but instead, it just looks like a Godzilla clip show.
Godzilla Vs. Hedorah - I love this one, so its hard for me to criticize it, but I understand why the film is off putting for some. The tone is all over the place. Some times its a ponderous and gruesome horror film and other times it is a trippy and weird comedy. While I appreciate it for being what it is, may picking a lane and staying in it would have been better for most.
Godzilla Vs. Gigan - Again...lose the stock footage. Actually, did we even need the stock footage? There is enough cool stuff in the final battle that I think it would work just fine if you cut it out. Its just distracting to see so much old footage spliced in with the new stuff, which is actually kind of neat.
Godzilla Vs. Megalon - Good gravy, I don't even know where to start here. I always hated Megalon's design and would have liked for him to look more like a real beetle instead of a man in a bug mask. So I'd change that. Also the use of heavy stock footage is annoying. Also, I never understood why Megalon needs a robot to guide him to the city to destroy and then he's completely lost without it. It would be like the end of Godzilla Vs. Gigan where Ghidorah and Gigan are broken from the mind control and they just flop around like idiots.
Godzilla Vs. Mechagodzilla - The ending was a little weird where Dr. Miyajima, Masahiko, and Nanbara are shown escaping, but we never see them reunite with the rest of the characters. The dub kind of implies that they died, but the original language implies that they escaped. Would have been nice to get something more definitive there. Also, with all that build up, I would have liked King Caesar to be a little bit more impactful in the final battle.
Terror of Mechagodzilla - Not much to change as I really like this one, and finally seeing the uncut version fixed many of the issues I had with the film. I guess I would have liked for the final battle to be a blood bath like the previous film was, but this film felt more like the films of the 60s, which wasn't really the style at that time, so maybe Honda wanted to honor that. Who knows?
The Return of Godzilla - I wish they had delved a little bit more into Prof. Hayashida's history with Godzilla. Sometimes I wonder if the movie should have been about that: A guy who has hatred towards Godzilla for losing his family, but then coming to terms with it over the course of 30 years.
Godzilla Vs. Biollante - Small detail, but I would have liked an explanation in the film for why Hayashida's plan to stop Godzilla in the previous film is no longer used here. I mean, this isn't like the Oxygen Destroyer where the creator was killed and took the secrets with him. This is a pretty full proof permanent solution, is it not? Some type of explanation, or even an attempt to use it again and it fails, would have been nice to see.
Godzilla Vs. King Ghidorah - I love this one, but Emi Kano needed to be executed better. As is, she's either a person who knew what would happen and realized the error of her ways (which was probably the intent) or she's a complete moron that got duped, and somehow didn't see what was going to happen, even though she had a direct hand in making it happen. Also, why is she so ra-ra Japan now when she works for an organization that is looking to prevent their rise to economic prominence in the future? You could say that her experiences in past Japan warmed her heart to it, but we don't know what her life is like in the future, so there is no contrast we can see, and her change seems to be out of nowhere. A little tweaking to the script could have executed this better and get the kind of character they were probably shooting for.
Godzilla Vs. Mothra - Well, to me it is weird to have an environmental message when its actually a meteorite that awoke the monsters. I mean...that isn't humanity's fault, is it? If you're going to have an environmental message, maybe having the monsters arrival be the direct fault of mankind's abuse of the environment would be a good place to start. Also, the movie reenacted too many scenes and plot points from the original Mothra for my liking and I would have liked to have done something a little different with her.
Godzilla Vs. Mechagodzilla - To this day, I still don't understand why Aoki was drafted to G-Force against his will and off the project he was clearly capable of working on, nor do I understand why his superior berates him for having a hobby. I mean...you all drafted him. Didn't you know what you were getting? Maybe it would have been better to have him willingly sign up, hoping to be a military hero, and we see him struggle, train, and get better over time.
Godzilla Vs. Spacegodzilla - Drop the Yakuza sub plot. Its dumb and derails the movie. Also, the not fully realized romance stuff is unnecessary. Keep the focus on Yuki and his Ahab like obsession with Godzilla, and how his goals conflict with saving the Earth from Spacegodzilla. That's where the real meat and potatoes are. Oh and why they went from a "Baby Godzilla that looks like Godzilla" to an obnoxiously cute little puffball is beyond me, lol. Change that please (well they did in the next film, but hey).
Godzilla Vs. Destroyah - Part of me wishes that Godzilla got the kill shot on Destroyah before melting down, but he got to take center stage anyway, so I'll live with it. While it is a fantastic scene, I think Godzilla's death would have played better if there was no dialogue at all, and we just saw the characters facial expressions.
Godzilla 2000 - The whole bit with Yuki trying the find out information about the aliens and then Shinoda taking her place and risking his life to find out all feels a little off when the information they gather in no way helps Godzilla defeat the alien. If they had discovered some weakness or found out SOMETHING that could be used to help fight it, then their risking of their lives would have meant something. Instead, it didn't feel like they found out anything that important and then Godzilla just shows up to fight the big bad and takes over for the rest of the film. Maybe rewrite it in a way where Shinoda found a way to signal Godzilla to lead him to the UFO, knowing that Godzilla was the only thing that could stop it, and Katagiri, feeling that Godzilla will only make things worse, tries to stop that. I don't know, I'm just throwing ideas out there.
Godzilla X Megaguirus - I was always a bit surprised that we never got to a point where Kiriko's obsession with getting revenge on Godzilla didn't lead to her realizing that she messed up. It was her group's testing of the Dimension Tide that released something far worse in the Megagnula swarm and eventually Megaguirus. Or at least, it should be viewed as something worse, but the G-Graspers focus is still purely on Godzilla, and Megaguirus is seen as more of an interruption that prevents them from finishing him off. They never really devise a plan to stop Megaguirus, or come to realize that their overzealous nature in dealing with Godzilla creating something much worse. They just go about as planned, which always kind of undercut Megaguirus as a villain to me. It almost felt like she was there because Godzilla has to fight a monster, making her presence in the film feel like the script was fulfilling an obligation.
Godzilla, Mothra, and King Ghidorah: Giant Monsters All Out Attack - Obviously, I would change the guardian monsters around. Ghidorah as a good guy teamed up with Mothra never worked for me. If they had gone with Mothra, Baragon, and say Varan or Rodan, I would have had an easier time accepting it. Varan would have made a lot of sense actually given his god-like status in his original film. Also, Gen. Tachibana's survival at the end was always baffling to me. Part of me wishes he had just gotten the Serasawa style sacrifice death, but even if they didn't want to do that, the sheer mechanics of his survival are off the wall. His sub gets swallowed by Godzilla, and he uses the opportunity to blow a hole in Godzilla's chest from the inside. Godzilla tries his atomic breath, but it comes out through the gaping wound and SOMEHOW, Tachibana's sub wasn't destroyed by that same atomic blast. Initially, I thought Godzilla was going to do even more damage to himself by exploding the sub inside of himself by doing what he did. As is though, I guess I'm just supposed to buy taht Tachibana somehow survived the whole ordeal.
Godzilla X Mechagodzilla - The next film kind of fixes it, but I always felt like the lack of resolution to Kiryu being possessed by the spirit of the 1954 Godzilla was off putting. Its an obvious problem and makes launching Kiryu super risky in the future, but they decide to do it and the problem never comes up for the rest of the film. Um...ok. What did they do to fix it? I guess it didn't matter in the end.
Godzilla: Tokyo SOS - While I enjoyed working the original Mothra film into the continuity of this film, the "Mothra Greatest Hits" aspect of it felt a bit repetitive. I would have liked more different stuff.
Godzilla: Final Wars - Less would have been more. Cut down on the kung fu fighting. Cut down on the weird and out of place comedy (like the scene in New York). Cut down on the obvious movie references (Star Wars, Matrix, etc.). Also, how the people that became disguises for the Xileans survived...yeah, that was the biggest WTF moment in a movie full of them, lol. Just keep them dead. I wouldn't have questioned it. Finally, this was Gigan's big return after over 30 years...it would have been nice if he didn't get not one, but two undignified deaths out of it.
Godzilla (2014) - The obvious one is to keep Joe Brody alive, at least through the 2nd act. He was the emotional core of the set up to the film, and I think it would have worked better to have the movie about the father and the son rather than just the son.
Shin Godzilla (2016) - I love this one, so there isn't much for me, but if you're going to have one of the Japanese actresses play an American, it would probably be better to find one that can fluently speak English. I guess that doesn't matter to Japanese audiences, but its a little distracting to English speaking audiences when she's clearly struggling with it.
The Godzilla Anime Trilogy (2017-2018) - Honestly, you could have trimmed the fat on this thing and make it all one movie, and it probably would have worked much better. There is a fan edit begging to be made there. Also, all that build up for Mechagodzilla and Mothra and to not really get them feels like we were fed nothing buy lies....LIES! Just give us radically evolved and crazy versions of Mothra and Mechagodzilla like we got with Godzilla and Ghidorah. Come on guys! Be cool!
Godzilla: King of the Monsters (2019) - I would have been nice to have Charles Dance play a definitive role in the climax (say he followed Emma to stop the Orca from being used to stop the Titans) rather than just being used for a sequel bait-y Marvel-esque post credit scene. Also, it would have been nice if there were fewer quippy one liners. We didn't get a TON of them like I was dreading, but some of those could have been cut.