Definitely AoE looting takes the cake! The Black Market Place is a really cool idea too since you can get some items that were no longer obtainable. The new editions for mounts is also a plus! Also in patch 5.1 making some of the old raids that required two people to complete them less impossible for the solo adventurer.
Misteweavers and pet battles!
My favorite part of Mists of Pandaria has been the raids. Although I have not been lucky enough to reach an item level past 479, I am excited to see all of the new development.
My favorite thing about MoP is the new achievements, especially the ones for multiple alts and reputation achievements too!
Removing the dailies limit has to be the best. No need to choose which 25 you are going to do today, just start doing them.
The story is epic as ever. I'm having so much fun the the lore and the pet battles ware better than i was expecting. Really having so much fun lately
I loved the Pet Battles and the Account bound mounts!
The big step the devs added for separating pvp from pve, by introducing pvp power.
I loved the monk, specially the healer.
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I am still stuck on the way the classes feel more different from eachother, but yet their own individual thing more than ever before. I love how the specs also give you a completely different feel for your class.
I would say the new class, i really enjoy myself as a monk heal i love being a melee heal
my absolute favorite thing so far has been pet battles. too many and too much fun so far
My favorite thing are the lost treasures. BoA items just laying around can't beat it.
The awe inspiring peacefulness of the zones, together with the storylines I really like, for example: trying to make an alliance with the Pandaren.
I would have to say all the new In game cinematic story line I enjoy feeling like I'm watching a movie when I am playing
New ambience and fantastic music.
The art and new zones are amazing. Pet battling is really fun! AoE looting is very helpful. :)