I know what you mean i was ****ed when Skyrim ran like crap with my 7970, but what i was saying was, since Nvidia and Warcraft online were buddied up maybe this is why AMD found it so hard to get it working? Its not the first time Nvidia titles have ran like crap for AMD users.
But yeah i dunno what could have changed with an expansion to make it not work aswell :S
Skyrim running fine on my 7950s buddy.