My favorite part has to be the whole theme for the expansion :) - I've always really loved the Asian culture, and a whole expansion based on that "Asian" kind of thing is soo lovely :)
AOE-looting, Warlock changes ( current and upcoming ), new areas and no flying until lvl 90.
My favorite part is the looting change and storyline.
AoE looting and the goblin @#$%^&!
Monks are my favorite part of MoP so far. With the new patch hitting EU servers tomorrow and Operation Shieldwall coming, I believe things are going to be even better!
the new zones
My favorite part is definitely the Stormstout Brewery dungeon. It is my favorite dungeon in the game now because of the NPC dialogue, Ook-Ook, and the the last boss.
The whole new land filled with mystery, adventures and treasures. I couldn't ask for more.
I simply love the music, match perfectly with the environment
Well... pet battles since the game itself got boring.
I really love the soundtrack. The music is so different from any of the other ones, and the oriental undertones to it are so beautiful. The pet battles are another really fun aspect of MoP; I can finally do something, besides walking around, with the veritable zoo of companion pets I have accumulated. :-)
My favorite part of MOP at the moment is that I can actually pvp with my warrior again :)
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My favourite part of mists so far is when i found out blizzard really does think daily quests are fun... especially when they don't give enough rep, causing you to have to do them 35 days in a row to reach revered(or exalted if you want the garbage rewards that come with it), all while trying to avoid the world pvp that happens in daily areas on high pop pvp servers (cause that's what i want, to spend more time doing something i hate due to graveyard runs), just to be able to buy gear that takes 2-3 weeks to get enough VP so that i can actually get into raid finder and then have raid finder drop no gear for me for 4 weeks straight... Yup dailies are my favourite part for sure.
I really like the environment, it is beautifull. The daily quests are awesome too and the fact that there's people everywhere, not only in the main city like happened in the old expansions.
So far it is the general gameplay... most of my friend give up after cataclysm ... but i lasted with my faith in wow till now and BAM! MoP ROCKS! gj blizz ... keep good work... and ban bots guys srsly...:D
The new zones and environments are both awesome. The monk class is a lot of fun, and the expansion as a whole looks breathtaking!
My favourite thing so far are the many many many lore stones. I'm a huge lore-nerd I know. :)