I enjoy using Vista also, but is it not without its bugs. There are only so many issues which can be blamed on 3rd parties. I have completely ditched XP now, not even bothering to dual boot, I need the space.
Here are a few bugs which I have come across and can remember:
Folder views change during a reboot, for example, the games folder will display as large icons one minute, then next they shift to details, possibly after a reboot.
Vista loses network connectivity after between 12-16 hours of being on. The only way to resolve (other than reboot) is to stop, then start the Network connectivity service.
Vista will not recognize 4 gb of Ram correctly. It will either stall or not boot at all with it installed (possibly BIOS/Windows related, works fine in XP, linux)
Vista changed the way sound is processed so AC3 wont work (possibly driver issue, may get better as these mature)
I can live with the above until fixes are found and generally enjoy using the OS. I get good FPS with Nvidia drivers and gaming is a pleasure on Vista, due to the "Games" folder.
I don't use Media centre, seems a waste of time to me when you get the perfectly good Media Player and I can locate and play files much quicker. Winamp is the only solution for music for me, I love its nice uncomplicated, long list of music, I find it a nightmare trying to find stuff with Media centre. I think Media centre should have been searchable.
JMHO