MoP has the most enjoyable questing experience to date. I would sometimes refuse to queue for dungeons while leveling and finish all the quests in one zone before moving onto the next.
The new talent system is probably the smartest thing to come out of this game.
Player housing is a waste of resources. Guild housing is a bit more viable.
We should have magic, metal constructs (don't wanna say robots) as a playable race, as well as dragon-men. Preferably in the same expansion.
Lord Rhyolith is the coolest-looking boss in the game so far.