For me, Pandaria's strength was its atmosphere. Every previous expansion was about doom and gloom, end of the world type stuff. I was worried, at first, that Pandaria would be less epic by comparison. However, as I played it, the mellow/peaceful ways of the Pandaren was really a stand out feature. I thoroughly enjoyed the quests from 85-90. When I hit the cap, however, I found myself quickly bored with the same battleground/instance rotation. I attribute part of that problem to the class that I leveled, but I just find that the end game content isn't doing it for me anymore.