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I think the storyline and questing has been the best part. Whether starting a new monk at level one or resuming the questing from 85 it has been awesome! Not to mention the fast re-spawn rate of resources has been a huge benefit.
My favorite part of MoP so far are all the activities you have when you reach max level. daily quests, dungeons, scenarios, raids, pvp and more. Also I loved most of the quests and long storylines, most of them were very funny or had really good lore on them. MoP is the best WoW expansion so far.
pet battles are the best. almost the new mounts are cool too,i just love them <3
Without question my favorite part of Mists has been the super cool vanity/play items that you can get from the various rare mobs. I feel like my bank is half full now of ridiculous fun things!
the single one worth to mention is aoe looting...
The best part of MOP would definitely have to be either the aoe looting, or the new quest reward system. No more filling up my bags with useless bop gear.
My favourite part of MoP are the rare items you can find in the world, followed closely by pet battles.
My favourite part of MOP is the scenery, im really liking the Chinese influence.
Pet battles and being best friends with Nat Pagle.
Pandaria is awesome! The landscapes, lore, races & creatures are stunningly detailed and rapidly becoming my Happy Place :D Exploring is a mini-Vacation... AoE Looting is a blessing! Pet Battles are amazingly fun and fulfills my love for collecting critters lol
Best part of MoP is the music, and actually the only good part.
Pet battles !
I love the way that was the environment created. Soundtrack and story. :)
There are so many additions to mists its hard to pick just one as my favorite, but i have to go with the changes to the affliction warlock.