What is so bad about Windows? It gets the job done quite well.
You're talking to the wrong guy for this one...
Let me see, for starters, there's the fact that until recently, Windows should have been called WinDOS, and probably should have been called an operating environment instead of an actual OS, since it was piggybacking on another (DOS) kernel. Until Win 7, it was never fully integrated. Not to mention that they think they can re-invent the wheel as many times as they want, to the detriment of market creativity and their old userbase. Calling this design revolutionary, or calling the Natal revolutionary is like when Al Gore claimed to have invented the internet. It's not true, and the resulting product will probably be just as bad, if not worse, than their previous attempts.
EDIT: and if that's not bad enough, their track record for crappy products being the status quo means that when they finally get something right, people think it's a revolution, when in reality they've been holding everyone back with their own stupidity and should have been whacked for their ineptitude.