Vista was beaten to death way more than it needed to be. The problems with it were blown out of proportion. It actually runs quite good on pretty old hardware. Much older hardware than lion or snow leopard are supported on. What happened with it is many manufacturers were putting extra crap on it and in the first month driver support was poor. Microsoft addressed the problems with manufacturers loading stuff by putting stricter requirements for system images on OEM copies especially with windows 7 and later copies of vista. However within a few months it caught up and performance of it was great. However apples ads pretty much ruined its reputation and they downright exaggerated just about everything. Also the user interface of vista is actually incredibly consistent. All the wizards follow the new format and they all look similar. Say what you want about it but vista runs better on 1gb of ram than Lion does. I have tested both with this amount of ram. People fail to realize how much of vista was brand new. The driver module for gpus, WDDM, was completely new and a gigantic improvement, vastly superior to XP's and Mac OS X's, runs outside of the kernel in userspace now which is why vista and 7 can switch graphics completely on the fly without even logging out. If its crashes which is rare the screen goes black for a sec and the driver restarts. If a driver crashes in XP or Mac it cause a BSOD or Kernel panic respectively. It allows scheduling of direct x and open gl which allows multiple directx and opengl application to run concurently without a large performance penalty. The entire windows shell was pretty much rewritten, Explorer shares very little with its XP equivalent. UAC is more than just a pop up box. There is a ton with it regarding virtualized directories and registries and how it chooses to elevate privileges. Also it pushed software makers to adhere to permission properly. Pretty much every software now i capable of running without admin privileges now. They only time you see the popups today are when you install software, which is also true in mac as they require you to enter a password to make changes to system directories or settings. I just figured I'd address a lot of the ignorance regarding the development of windows vista.