OS X is not buggy, nor is it slow, and nor is it worse than XP.
I have been using OS X full time since OS X 10.1 came out last September, and let me tell you something: OS X really IS light years ahead of OS 9.
I rarely have crashes anymore with OS X. In contrast, I had a crash at least once a day, if not more, because I used it all the time. This stability alone is reason enough to upgrade to OS X: it increases my productivity probably tenfold because I don't have to restart so much (rarely at all).
Furthermore, OS X 10.1.5 is PLENTY fast on "old" hardware. I'm sitting at a Snow G3 iMac at 500 MHz, which many people claim is not enough to run OS X decently. On the contrary, it runs OS X MORE THAN ADEQUATELY. I know many people who are completely satisfied with OS X on even older machines, too.
In retrospect, it's probably futile to argue like this, especially when you're one of those deluded users who think that switching to Intel processors will be an easier transition than from OS 9 to OS X. NEWS FLASH: OS X is the future, and it is stable, reliable, much easier to use, and overall much better. Get over your obsession with OS 9 and make the leap.