VIII usually gets alot of hate because of it's overall complex-but-really-isn't-if-you-stopped-to-think-about-it-for-a-second plot/gameplaysystem. (At least, that seems to be the complaint from many people who I've known to hate the game).

I actually thought IV and VI were really dark as well (VI should be self-explanatory). But I did think V and IX were colorful and light-hearted.