I think artistical style can sell a game much better than any sort of realism in graphics can. If everything pushes more for realism, then a unique art style can set your game apart from the others. A style can convey a deeper sense of attitude or emotion or immersion, because you're breaking this experience away from reality. Its a much deeper detachment from reality.
Sure, realism can be a part of that style, but it cannot be the only aspect of it. Otherwise, things clash together, and screenshots or demos of multiple games can all look similar. Things as small as the HUDs (Such as Metroid, Halo, Haze.) can be stylized to fit the mood of this style, and can certainly detract from the experience if done poorly.
I'd rather have a game with plenty of style and artistic flair, with enough realism to be believable, than nothing but realism itself.







