Their drivers are a lot better than they used to be, however I've found that support tends to dwindle somewhat when your card becomes 1 generation old, my 4870 crossfire rig was really good but I started having a lot of issues near the end of the 4xxx gen and soon swapped to a 5970 in the next gen line up, again that was fine for a long time but when the 6xxx gen came out support seemed to be dwindling again, eventually I abandoned that for a 580.
Part of that problem is made worse because of multi-gpu but I can't help but feel it probably spills over to the single GPU cards as well. I'm hesitant to judge based on how products launch these days, how support lasts into the following years is equally as important, if not more so.
Their multi-gpu support does tend to dwindle, the single cards are well taken care of those. The 5870 was getting improvements all the way up to the 7970 release.
Toyota, I've been using ATi cards since the 9000 days. The only issues I can remember are
Indigo prophecy having transparent textures on my 9600XT - Fixed with a driver update (my drivers were probably 6+ months old since I installed the ones on the disc)
Lowish performance in NFS-Shift with my 4870 - that was fixed with a game patch. Not a driver update
Low performance in games when I have youtube open on my 4870/5770. The clocks would be stuck at video clocks, not 3D clocks. Don't have that issue anymore, must have been fixed in a driver somewhere.
My 5770 being stuck at 4870 clocks - that was cause I switched cards without reinstalling drivers.
Those are the only "driver" issues I've had and I play all the latest games and update my drivers every release without even looking at the changelist.
The only real other issue was the youtube thing. The rest was simple user error and game issues.
I've never had any other issues with drivers and I update them every month without fail (never had my card burn up cause of a driver). So in reality I've only had one issue. How many of the issues you've seen are actually driver problems and not problems with the game, PC, overclock or just user error.
Call me a lair if you want, but this is from PERSONAL experience. I don't say much about nV drivers cause the longest I've had and nV card was 2 months. No issues there either. When last did you have an AMD card so you can comment on their drivers with such certainty.
And if you think I don't play many games. I'm playing BF3, Skyrim, SC2, DX: Human revolution and Dirt3 without any issues at all. So in 6-7 years, I've had 1 REAL driver problem with AMD cards.