Yeah even when your run windows AMD's still not worth the pain. OpenGL games like Rage are bugged on release for AMD owners and the catalyst drivers often introduce terrible bugs. I don't upgrade my drivers unless I the older ones have a known bug with a newer game.
http://www.youtube.com/watch?v=LsD3y3vnsM8
http://www.youtube.com/watch?v=2pSHOJKcFU8 (the youtube comment is wrong, it didn't happen only with skyrim, I had the antialiasing bug with lots of games after I upgraded to that version of the catalyst at the time)
This is what happens (and happened to me) when you trust AMD with their drivers. That one of their mid or high end card can work like shit with one of the best sellers on the PC platform says it all about how much AMD cares for their customers : they're giving us the finger.
How could AMD stay in business with such subpar products is beyond me. I know they'll never regain my trust. That's just not possible. Too many problems on too many platforms.