After reading all the posts in the support forum for pc users it seems this game is a huge dissapointment, apparently the game looks like crap on pc, and the textures are low ress, they said the pc textures would be better than on xbox. Another thing is that they say you need a controller to play the game, playing with a mouse is apparantly terrible. I wish i had bought it for xbox now.
If they're saying it's crap, then it's because their computers are crap. Enough said really. I've seen plenty of awesome screenshots, and they most certainly do not look low res.
But do as you like, if you want to get it for 360, go ahead. But be warned, you will have worse graphics (fact), and no mods (obviously).