Having tried both, I have left XP on my main games playing machine. I like some of the features it has, and I turned off everything else. Personally, I took the short time to get things sorted just how I like it, and I have never had a problem with this OS, so it's here to stay.
MS really did screw up somewhat when they named the next business OS (and continuation of it's NT line) 'Windows 2000', having gone 95, 98, 98SE, most would assume that 2000 comes next. Still, not even billions of dollars can buy you common sense.