They obviously had to sacrifice some power in order to bundle a Kinect and still give it to us for a reasonable price. It's the same thing as with the Wii U to a degree.
It's funny though, because last gen the 360 was weaker and thus easier to develop for, and as a result multiplats were way better on the system. Is there a chance of the same thing happening again?
Currently playing:
Bloodbath Paddy Wagon Ultra 9