When you will be 3d developer, then new experience will open about ATI drivers. NVidia also have a lot bugs, but they are rarely same bad. ATI users seems thinking that it's normal when game running at low framerate unless new drivers will be released? 11.11.11
Granted that ati hasn't exactly been a strong opengl contender like NVidia or in the realm of Linux support..... it's not entirely bad..
Unfortunately due to NVidia's questionable tactics with several games and their development resulting in ati being purposely cut out and actually blacklisted in some cases without any official notice.... It's kinda hard to ati to wedge themselves into the developers seat to get some things sorted due to NVidia's questionable ethics.... threatening some developers of some games or 3d apps that they will remove their own products and money and their NVidia support completely if they so much as give an oz of support for the competitor. This should be totally ilegal, but mostly goes without so much as a mention.
I don't know how many times I've had discussions with some 3D game Developers that had clearly stated that they've created an ENTIRE game without ever EVER testing it/running it on the ATI video card at all... YES this does happen, I've gotten it directly from the mouth of some of the people doing work on even triple AAA titles.... Essentially being told to work with NVidia products, ensure that it's working 100% flawlessly on them, with total disregard to the ati product line. Whatever happens will happen is the going motto with ati, and they leave it to ATI to fix THEIR product in the end. Pretty terrible developing i'd say. Nvidia gets to sit back easy while ati's driver development team continues to slave over trying to fix the mistakes that essentially NVidia purposely implemented.
This goes back through more than an entire Decade where NVidia has even published documents slandering/lieing/being completely deceitful, handing money under the table to ensure that their competitors be it ATI or 3DFX or Power VR never get their foot in the door. Some of it is quite ilegal.. yet still managed to slip through the fingers.
Considering this, i'd say ATI has done a pretty amazing job. Doesn't mean that they haven't made some significant mistakes.. like removing the crossfire option for their videos cards with 2x gpu's on it.... that was silly. Or that fact that they eliminated one of the kings of their developers namely Terry Makedon (Catalyst maker) the one that brought ATI's driver development full 180 SEVERAL years ago now.