Yeah DICE/MS has completely forgotten about Rallisport Challenge series. GO play RS2 and It's still one of the most beautiful racers years later.
Crimson Skies was a amazing game that I have no idea why MS has not revisited on the 360.
I believe 2k Sports has the Links team and title but has done nothing with it. Links 2004 is still my favorite golfing game to this day.
Oddworld: Strangers Wrath: I'd like to see a new one tho I doubt we ever will.
Phantom Dust: What a gem, where is the sequel?
Otogi 1/2: From Software came back with Ninja Blade instead of Otogi 3? Shame on them.
Voodoo Vince: This was Microsoft's best platformer. I'm guessing it didn't sell well though.
It's just that simple.