This article slams Balmer as responsible for the Microsoft stack ranking employee evaluation system:
"... For that reason, executives said, a lot of Microsoft superstars did everything
they could to avoid working alongside other top-notch developers, out of fear
that they would be hurt in the rankings. ..."
Q (Seattle Times): A lot of people have slammed Microsoft's stack ranking review system as contributing to a noncollaborative atmosphere. Is the kind of cultural change you want to effect possible with that stacked ranking system still in place?
A (Ballmer): We're doing our performance reviews now. We're finishing up our year (and there are) no changes to—no—I'll say minor changes to our system.