I can only vouch for the 360 version because it's the only one I've played. But I can imagine the single player campaign is solid on all 3 platforms so long as you have a strong computer. I would imagine by the 360 graphics (which are gorgeous, btw) it would take a really good PC.
For online play, Live is booming right now of course. I'm sure the PC scene is strong as well online.
I'm glad you brought that up though because it's real thick of me to not mention that it's available on those other platforms. I game exclusively with Micro-$haft
