I've got the 360 version I like it. Haven't had a chance to get the pc but I believe you must have a live account to play online. Kinda like what they did with shadowrun.
As a pc gamer, i agree with the 360 guys. My worst experience as a pc gamer was buying Dawn of War: Soulstorm of Steam. I bought it in February and it still does not run because its so buggy. Alot of other Soulstorm buyers had the same problem of not being able to start the game.
Get the 360 version, you have a 100% guarantee it will run.