I absolutely love MW2, it's one of the better FPS games I've ever played.
That being said, I will not be purchasing this game until the PC issues are resolved. Sorry, but $60 for a game that gives me less than its' predecessor is not reasonable in the least.
Just fyi, if you don't want to be bothered reinstalling WoW, updating, finding your addons again, etc., if you have a large enough storage drive you can just copy the wow folder over and copy it back after you reinstall the OS. The game still runs perfectly fine.