Checkout some of the keywords from this article on the Guardian.

“…elephantine parturition… Security vulerabilities come free with all version. … interminable corporate nightmare. … only a shadow of what it was envisaged… engineers were trudging through their death march….

Ouch.

Ultimately the article makes the (IMO entirely correct) point that the future lies in virtualization. Ultimately, you won’t have to decide which operating system to run. You can run them all, each nicely partitioned off into a virtual area. Companies like Microsoft which rely on customer lock-in will find their hold slipping as the annoyance of trying new systems and new ways of working are continuously reduced. It’s hard to keep the boys on the farm once they’ve seen the big city.