{Shrug}  I may have to try the ATI cards again, then... but my experience over time has differed from yours. 
When I last used an ATI card, the drivers that ATI released were so problematic that the recommendation was to use user developed/modified drivers instead.  And even then, I found them to be a headache - a driver that worked well with one game exhibited crashes and/or graphic anomalies in another. 
Nor did I ever get the sense that I was alone in my frustration. 
<S>