Halo\'s \'arcade\' feel is what turned me off to it, but probably what made it so accessible to the majority of \'casual\' gamers who love it so much. An easy to play and fun FPS that you can just jump into.
I love realism, on the other hand, and that doesn\'t mean realism as in COD2 WWII fighting, I just mean in terms of physics, damage, environments BASED ON the worlds that the game is in.