"I agree, a lot of people probably owned a 360 with a PS3 and there was obviously no need to rebuy it."
I don't agree, but regardless, you'd better never use the combined HD userbase argument or I will throw this in your face.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs