Mreh. Lots of Ati haters here.
As a hardware reviewer for Tom's, I change and play with all kinds of videocards quite often on multiple systems, I uninstall and re-install drivers wayyy more than the average bear, and I've not experienced a notable problem with Ati or Nvidia in years.
In my experience, both Nvidia and Ati have their quirks, to be sure. Ati's catalyst takes a few seconds to start up in XP; is that the huge deal you guys are talking about? Nvidia has some Vista problems, too. But I haven't come across any show-stoppers from either camp for a very long time.
DOA cards? On this board I've seen doa cards from both camps. If any manufacturer in the world has a 100% track record of no doa-hardware, let me know and I'll invest in them immediately...