That's because the PS2 was still the daddy last gen, things are different this time. However many copies MGS4 sells on PS3, it would be pretty much guaranteed to sell more on the 360 due to the increased install base.
Don't quite agree with that. Think most Xbox players only interested in Xbox first person shooting games only. They only want Halo or Gear of War and will talk down the shooting experience of MGS.
Haven't they already expressed themselves by putting in the hard work making the MGS VS GOW2 video?

