[citation][nom]1337RPG[/nom]If you havn't played MoP you shouldn't be saying anything. The fact is that it has more raid content than any other expansion. The fact is that it has the best leveling questing since Wrath of the Lich king. Cataclysm was the worst expansion ever, ask any hardcore player.[/citation]
This. I skipped over Cata altogether after leaving at the end of Wrath. All I really have to say that I can understand why it looks ridiculous from the outside (Pandas!?) but the implementation is better than any expansion to date. Instances and raids alike feel refreshed instead of rehashed, and the new PVP system means I don't have to play 40+ hours a week just to have a fair chance.
PS: I played GW2 through to lvl 80. Hands down the best leveling experience I have had in an MMO to date, however there is a complete lack of end game which is a massive deal breaker.