Deep Sea Monster Raiga (2009)
I'm quite certain the filmmakers and the cast were all under the influence of a few things when they made this movie. Depending upon your thoughts of it, that's a good or bad thing. One thing we can all agree on: this movie is a COMPLETE cheesefest, from the ridiculous acting to the propostrous dialogue to the amusing "effects". I have to admit that on a certain level it's entertaining, although there's no way I could call it a "good movie". In that sense it's rather like Reptilian (1999), except this is probably better overall. So in spite of the low score, if you can hunt it down, it's worth a watch for any dedicated kaiju fan. If you aren't (in which case you'd not be reading this), you'll need a certain sense of humor to accept it. Am I remembering correctly that two different companies hold the rights to Reigo: The Deep-Sea Monster vs. the Battleship Yamato and Deep Sea Monster Raiga? I wish we could get a nice cheap release of these.
Gappa: The Triphibian Monster (1967)
Nikkatsu Corporation's first and only entry in the giant monster sub-genre is actually not too bad. It's certainly not a great movie or anything, but compared to some of other giant monster movies from around this time, Yongary, Showa Gamera films, etc, this is comparable. The (simple) story is awfully similar to Gorgo (1961) and therefore can appeal heavily to young audiences; I like Gorgo a lot more but that's personal I suppose. The practical effects and suits actually compare to a lot of these other 60s and 70s movies as well, although the Gappas themselves as a design are hard to take seriously to the point where I don't know if kids would think much of it either.
Be kind, for everyone you meet is fighting a hard battle.