?!
The theme is your biggest problem? wtf are you smoking?
What about the adoption of upstart? The new ubuntu software center? The fact that the repos aren't fully updated yet? Update programs without updated plugins (Exaile, VLC, etc), Programs not recognizing the newly updated kernel (ATI drivers?)
Hell... if the theme is your biggest problem, then I call that a painless upgrade :P
PS: I still love the new release ^_^ I've managed to work around all my problems and I have to admit, Karmic is pretty slick