It's a rather odd question; it implies that MS supported new IP this gen.
Outside of Gears of War and viva pinata, I can't think of any exclusive new IP MS had, unless it was a minigame type of thing from the kinnect, or that mediocre launch game... with the female character (it was by rare I think)
So why would people expect it now?
Are people just trolling MS or what???
Seriously? Alan Wake? Kameo? There's probably something else I'm forgetting that isn't Kinect related. But add in Kinect titles which are still full fledged games despite you not liking them, and that grows.
It could be argued that most of the new IP this generation started on X360, likely with some help from MS to get things running. Bioshock, Left 4 Dead, Mass Effect, Saints Row, Dead Rising, Crackdown, Lost Planet, Lost Odyssey, Blue Dragon, Chrome Hounds, Battlestations Midway, Condemned: Criminal Origins, Venetica, The Outfit, The Last Remnant, and that's just what I can think of off the top of my head. I'm sure there's many others.
Sure some of those eventually came to the PS3, but they all got their start or are still exclusive to the X360. And sure, MS could very well have paid studios for exclusives on some titles. But that isn't much different than footing the bill to develope a title internally. Granted it has a smaller return on investment, but it also has a much lower risk profile.
That some claim there has been little to no new IP on the platform is ridiculous. To claim that X360 is all shooters is even more ridiculous. Look at that list of new IP. There's a lot of games that weren't shooters. If people want to claim that the top sellers are dominated by shooters, that claim also applies to the PS3.
Yes, Sony has more first party exclusive. No doubt. That's pretty hard to avoid when you have more internal studios and very few franchises with the following of the MS backed franchises.
If Sony had a Halo equivalent franchise, you can bet they'd constantly release sequels for it as well. But their best selling franchise is Grand Turismo. Oh crap there goes that theory. It's on, what? The 5th version now? The next most successful franchises for them at the moment are GOW and Uncharted. And, uh, guess what? Yeah, they are getting sequels.
Any publisher or developer that doesn't give consumers what they demand is stupid. MS has a limited amount of internal studios. If consumers demand more Halo (and they absolutely do) then that's one studio tied up. If consumers demand more Fable (and they do) then that's another studio tied up.
And to add to that MS is on a tear introducting bucketloads of new IP to support the new peripheral which people are demanding.
Ergo, just like Sony, MS are attempting to give people what they want. Only Sony hasn't found anything yet that people want quite as much as Halo, so they keep trying. If the positions were reversed and it was Sony that had Halo, they'd keep releasing sequels while MS kept releasing new IP in hopes of getting a mega blockbuster IP that tons of people want to play.
Regards,
SB