Id' say its not too good two of those other titles are multi-platform and sold well on PS3 too, as well as the fact that COD4 and AC combined platform sales dwarf GOW and other exclusives - signifying to developers its better to be cross platform than exclusive unless given loads of extra money. This applies to PS3 as well of course.
So really, Halo aside, what I see is that while 360 can deliver great sales (and PS3 is showing it can too) you're better of not being exclusive. Assuming GTA sells well on both platforms (which I think is a pretty safe assumption) it will only cement this fact further.
Still, it does show 360 showing better sales than Xbox for big titles - although I still think too many of its hits are in too narrow a set of genres for the console to achive massive sales itself. I also think that despite marketing spin otherwise MS's strategy of pushing for lots of exclusives has failed to pay off while the assumption that 3rd party developers would 'abandon' PS3 for 360 is now clearly a thing of the past.
Try to be reasonable... its easier than you think...
