Now see, I have always been fascinated by the idea of evil versus evil. I like seeing one evil character taking on another to prove which is the worst. So I like how aggressive Gamera looked, he looked even more scary than Iris (but Iris was scary more because he was so mysterious and hard to understand and I had hoped he was going to live up to the hype in the final battle and give Gamera hell). I love how Godzilla looked in GMK and found it unfortunate that none of his opponents could look (or act) half as evil or badass as he did. One of my favorite things about Godzilla vs. Destoroyah was seeing an evil, scary looking monster fighting another scary, evil looking monster (Godzilla with his glowing reddish eyes was pretty evil looking).
"Gamera 4"? I haven't seen that (unless you mean "Gamera: The Brave", in which it's fatal flaw was a cute monster versus a mean (pretty awesome looking) one.
Within Temptation, Flaw, The Panic Division, Tool, Lacuna Coil, Breaking Benjamin, Red, Lunatica, Katatonia, A Perfect Circle, Evanescence, Bush, Silverchair ('94-'01), Goo Goo Dolls, Linkin Park, Metallica, Delain, Leaves' Eyes, etc.