From what I've heard the PC sales are not spectacular although I don't expect the PS3 sales to be that great either. Midway have done a shocking job at marketing, hyping, even letting the public know that the game exists.
So it could go either way, but I still don't think the PS3 sales will beat the PC's. In fact, I expect this game to bomb quite hard. It's received no hype outside the internet hardcore at all.







