The article linked to below confirms some of my reservations re Vista:
1) It's too big and needs slimming down. A related issue is that it's too system-resource hungry.
2) Fix UAC or get rid of it.
3) One year after release and folks are STILL having problems with drivers?
If Windows 7 addresses those complaints in a serious way, maybe they'll avoid some of the present discontent over Vista:
http://blogs.zdnet.com/hardware/?p=1173&tag=nl.e539