You can play Battlefield 3 on a number of beastly machines. Surely, it looks best on PC (no surprise), but how about we let YouTube user Robbaz compare the game on PS3, Xbox 360 and PC? Go for it, Robbaz.
I think there's something beyond sad about PC graphics geeks. I played this beta all day on 360 and the reason I don't care about the graphics is that I didn't once think about them. I was too busy having fun and playing a game. But hey, if polygon count and texture resolution is important to you, then fine. Why not spend time in Maya rather than games if that's the way your mind works? Why not just enjoy the game and don't be such a sad geek about it?