Its the same as saying the PS3 doesn't have as much diversity because X Japanese game/genre sold better and hence they are all just either Japanese or Japanophiles. The reality is that the Xbox 360 is more dominated by one region and that one regions sales sets the overall trends for which games sell or don't sell on the 360.
This is further compounded by the fact that multiplayer games tend to snowball in sales as they get more popular because of the huge network effect of online multiplayer where the Xbox 360 definately holds dominance over the single largest cohesive multiplayer market in the console world with its strength in all native English speaking countries.
Tease.







