Firstly LBP sold 490k, as that US 1st week sales is really week 0.
Anyway, with most of those Xbox games, they are big established franchises. Gears is the exception and that had exceptional marketing
The Xbox has a less diverse user base, so obviously, out of those 4 games, 3 are shooters. With the PS3, you chose 2 shooters, though I would have chosen Uncharted instead of Resistance, which though is shootery, is less of a shooter than the rest. Incidentally, that game sold 195k first week, and sold 2m before proper bundling. This shows that a much wider range of games sell on the PS3.
If you look at the top 50 Xbox games, ignoring bundled ones, there are a huge amount of shooters
Anyway, hopefully the PS3 exclusives will sell more, as the biggest guns, GT 5 and FF XIII come out







