The problem with WoW i find is that each expansion gives more of the same...
there is nothing earth shattering. Even the devs know this which is why they dropped from 10 level expansions to 5 level expansions. For cata they claimed it was time was devoted to improve the main land for the base games, which i decided was an OK reason.
For the pandas though? I don't even know, since I haven't kept tract for over a year now. But it was another 5 level increase, for more of the same grind for a dungeon which you can only do weekly, a dead pvp universe due to randomly summoned guards, etc.
The game feels to...controlled...for lack of a better world. There is no "I'm going to hunt some weaker players to loot!" in pvp, for example. And this is on the worlds were pvp is supposed to be encouraged. My best memories of WoW were on the mainland where I engaged with pointless, intense, and completely random pvp battles with other players for nothing more then bragging rights.