Favorite part is the new lore and the eastern culture that was integrated in to WoW!
The quest story lines.
PET BATTLES!
I've enjoyed the pet battles; it's a nice new feature. It also feels like there's more to do at level 90, although I could use a few less dailies and a few more rewards from scenarios.
RARES EVERYWHERE
Pet Battles and the subsequent overflow of pets :)
I'm enjoying the scenery in the new areas.
The tillers and Chen!
I've been a big fan of the various rares thrown throughout the zones. Not to mention all the hilarious and fun vanity items that you get while questing. The zones aren't hard on the eyes either.
I really enjoy challenge modes, being able to rank yourself in time performance challenges against other players is something PvE has been lacking while PvP has always had a solid ranking system in place.
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AOE looting and the Pet Battles!
Surprisingly my favorite part of this expansion is the raiding. Some of the raid content is actually pretty good. Like will of the emperor tanking having to dodge the combos to get the buff, spirit kings where its 4 bosses in 1. Got to love them fights.
My favorite thing has got to be the raids. They are well made and are really fun, kind of like a Burning crusade feeling over them.
I really love the Grummles. They're adorable, funny and their luckydo's give an amazing buff!
I like those ooken Hozen who want to hit me in the dookers.
Pet battles are far more addicting than I thought they'd be.
My favorite part of MoP is the return of World Pvp. Being a vanilla player that is something I have missed.
i have really enjoyed the landscapes and the main storyline. i am looking forward to learning more about the races that have developed in this new land.