As Cliff Bleszinski said, the middle tier games industry is dead.
I think there's a lot of truth to that, but also exceptions, one that leaps to mind is Borderlands.
I mean middle tier in sales. I tweeted Cliffyb about this and he responded that Borderlands is triple A (well, he would being it's on UE3). But I think he meant in ambition, whereas his original quote was pertaining to sales.