I'm very disapointed that every 'evil' character from the warcraft series suddenly becomes a killable object in the World of Warcraft. Having to deal with Illidan and Archimonde(although they did wrap up the Archimonde-story pretty well cause of the Caverns of Time) to get my Tier 6 armor was a big turn off for me, I'd rather see some new boss turn up which we can kill than having to kill those major characters over and over again.
Adding Arthas/the Lich King to this list was another great disapointment, but I will get the expansion anyway as the new Death Knight hero class intrigues me, just as the new Inscription-system does + an increased level cap.


[Linked Image from miniprofile.xfire.com]