What kind of roleplaying is it if you don't have to make a decision about who to kill, just about how to kill? And why? "Everyone knows they're all evil". I don't want to play in a world where that works.
One in which there are forces outside of yourself and you are part of something larger than yourself. There's a celestial war taking place -- your struggles reverberate on the outer planes. Your decisions help form the planes of existence your efforts matter in the greater scheme of things.
Otherwise 'fantasy' just becomes a series of boring, predictable analogues for historical battles **cough cwitcher cough*
