People who bought computers with Vista preinstalled tend to be a lot happier than those who upgraded from XP, especially those who failed to run the upgrade advisor. The same is true of Windows 7. Even after following all advice from the Windows 7 Upgrade Advisor, I still had to jump through hoops to re-enable my connection to PCMag's Virtual Private Network after upgrading from Vista. Even the biggest Vista fans, the ones who've never experienced any upgrade tribulations, have to admit that User Account Control (UAC) can be a pain in the neck. Fortunately Microsoft made some significant improvements in it for Windows 7.
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