I agree with this. And it wasn't just Don Mattrick. Late in Ballmer's tenure there were a lot of VPs with poor track records who weren't being held accountable

I agree with this. And it wasn't just Don Mattrick. Late in Ballmer's tenure there were a lot of VPs with poor track records who weren't being held accountable (or, in some cases, were being given more responsibility). Microsoft is still feeling the impact of those people today.