Industry pundit John C. Dvorak recently release an article on Vista's 11 Pillars of Failure. John makes some good points including the code bloat, missing drivers, and the confusion around the number of versions. On the other hand, Robert Strohmeyer of PC World in his article 18 Features Windows Should Have (but Doesn't), covers items as if the shortcomings are because it's not a Mac. Where John points out valid issues, Mr. Strohmeyer uses the Mac as an example instead of identifying real issues.
So if you you want a refresher on why you should stick with XP until Microsoft releases the next Windows version, read John C. Dvorak's article; If you want to see what features you're missing by not having a Mac, read the article by Robert Strohmeyer.