1) you're lucky if you are able to install the driver and make it actually work after first reboot
2) you don't suffer a kernel panic within 1 day without doing anything special
3) you don't have issues with WINE
4) you don't suffer a freeze while watching some bullshit videos with VLC or whatever
5) get the list continued..
Dunno but haven't faced any of 1 to 4. Earlier I was on Catalyst 12.4. Now on Catalyst 12.10. Team Fortress 2 also runs fine.