Microsoft Game Studios is by far the worst publisher, ever. They have done more to damage PC gaming than all other developers combined. They have siphoned games from the PC and taken them to the Xbox and Xbox 360.
Also they have intentionally delayed games to the PC. Just look at Halo, and what they are doing with Halo 2, and various other games. Even though Microsoft toughted Xbox and PC conversions to be a simple matter, which they are because Xbox games are all designed and run on PC's, they try to coherse people into buying the Xbox by delaying and siphoning games to the Xbox. Microsoft Studios and the Xbox have done nothing to advance video gaming and have brougtht zero innovation to the market.