My favorite part of MOP has to be the pet battles. It's so addicting and I find myself leveling all of my pets and searching for harder to get pets.A close second is the Monk class. I like it when Blizz adds classes to play. The Monk class with the ability to choose DPS, Tank or Heals, gives us more options for a versatile class. Keep up the good work!
Has to be the gorgeous look and feel to the new areas
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The Brawler Guild....Fight Club revisited!
my favorite part of MoP so far is Chen stormstout... i don't know why but he is to awesome
My favorite thing by far is flying mounts.
The challenge mode dungeons are a great idea, and also like the storyline that carries forward the traditional themes with a new twist.
When I log in I have many choices as to what I can do. From dailies, to pet battles, from 3 different LFR's to leveling my monk. And everything in between.
My favorite part of MoP is the new talent system and the ability to switch talents easily.
the pet battles and the quests just kick ass. i like them very much. oh yeah and all the new pets :D
Definitely Pet Battles. I never played pokemon as a kid but now realise how thoroughly addicted I would have been :)180 pets before MoP, 460 unique pets now.
My favorite part of Mists of Pandaria is the change in the loot system. It's nice to do LFR and not hear people constantly complain about loot or hold items hostage in hopes of getting another item to trade for it. I also love that they removed the 25 dailies per day cap. You don't have to pick and choose your rep one at a time anymore. :)
Hunting the many rares for Glorious! and the odd stuff they drop.
It has to be the AOE looting and of course the return of outdoor raid bosses because of all the PVP that occurs. Open world PVP is back and more rampant, definitely a plus
My favorite thing about MoP is the design of the game. The artwork is gorgeous. Especially changes in the graphics of most spells. These have my eye's wide! Although, if I had to pick one thing specifically, it would be the Betrayer's transmog set for warlocks from completing challenges on Gold. Illidan has always been my most beloved NPC in the game, and this...well this is it. I can now BE Illidan. My hat goes off to you blizzard.