That's just wrong.
I've owned AMD cards since 2003 - a 9800pro. The drivers then were perfectly fine, as stable as the NVIDIA cards I had at the time.
So your own experience speaks for everyone at that time?
It is all well documented as Rroff has said, you don't just get a reputation like ATI/AMD did if your drivers were fine.
Nowadays I'd actually put AMD slightly ahead of nVidia as they seem to release quality drivers whereas nVidia seems to be more about quantity and hitting those day 1 release AAA titles.