I think both have they're proper places, but generally I like non-realistic games. Well maybe non-realistic environments. If the game is too cartoonish it can loose alot of feel also, but generally I like games that follow a distinct art direction. Fable is a great example, the character models are not too kid-ish, yet the environments are colorful and creative. But I also like games like Mass Effect which try for realistic character models, and sci-fi worlds.
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