When I got a brand-new HP Compaq Presario (C502US) from CompUSA, it came pre-installed with Vista. I was unhappy about this, but willing to deal with it because I figured I should get used to the new OS that was going to be everywhere soon.
Nothing worked well. WMP had codec issues, programs wouldn't run properly, and, most importantly, I could get no internet connection. None. Connecting wirelessly or through a wired connection made no difference. Looking online for solutions didn't help at all. Eventually I researched how to downgrade to XP and did so-- haven't had a single problem since. This solution worked out fine since Vista is NOT everywhere like I assumed it would be.
So, I would agree that your experience alone is not sufficient. Neither is mine, but I do have more people on my side who believe that XP is better. Vista may do SOME things better than XP, but the cost of those features outweigh the benefits.