Strange! I've been running 64bit vista ultimate for about 2 months. It's been great. I am currently dual booting xp and vista. I decided to keep xp just in case vista didn't work with something.
I've really been enjoying vista. It runs so much better than xp did. Since vista actually uses your memory, it caches alot of frequently used programs.
I've had no driver issues either, played cod4 and hellgate london dx10 with no issues.
The aero interface is really nice, but that's definitely a matter of opinion.
I can't comment on the 32bit version of vista though. But 64bit ultimate is working great. Whenever I go back to my old xp install, it feels like crap!