Halo, Gears, Left 4 Dead, are all big in America. COD plays better on XBOX. COD is better on Xbox.
XBOX got off to a great start with Gears, Halo, COD (better on XBOX), AC(better on XBOX) Mass Effect, Perfect Dark, Bioshock, Project Gotham, etc. Not to mention it was cheaper. Then in 2008, I think GTAIV sealed the deal by not only being released on XBOX, but also being better on XBOX. Then later that year Gears 2, Fable 2, L4D all released on XBOX and were all big in America. And the online was better. And it had a one year head start. And it was cheaper.
Ps3 still has yet to get one exclusive game to reach 2mil in NA besides MGS4 which was bundled. Hopefully that changes in 2011.
I still think that there will be a time where PS3 sells on par with 360 on a weekly basis. It depends on Sony's marketing IMO.
