The new Warlock Awesomeness (Mechanic + Glyph of OMFG awesome wings form!)
pet battles!
Pet battles
Definitely pet battles, and I enjoyed questing in Valley of Four Winds.
My favorite part of MOP is being a panda. :) I'm super cute!
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All the new raid bosses. i'm looking forward to you Tsulong your fight is fun for me as a healer in LFR.
I really enjoy the AOE looting. It was always a pain in the butt to click each and every kill, especially when you are farming a low level instance and kill 10 or more mobs at a time.
My favorite are the new quests, with the story line and the beautiful video scenes.
It's tough to choose one thing, but I'd say the music. This expansion's soundtrack has lent a real epic adventure feel to my character's travels through Pandaria.
I wouldn't mind winning one of these cause my current os is windows vista and lag seems to be issues.
I like the new Pet-battles :P
I thing I loved about MoP is the AoE looting. Made my farming cloths easier.
My favorite part is definitely not being able to fly until I hit 90. Brings back some nostalgia from BC when you had to wait until level 40 to get your first ground mount.