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My favorite part would be the dungeons and the raids
Pets, pets, and more pets!The pet battle system could truly stand alone as a game in its own right. How awesome that it's incorporated into WoW so elegantly.Totally rocks!
I love all of the stuff to do at level 90. I thought the farming was going to be silly, but I'm really enjoying that as well.
My favorite part has to be the return to a feeling of adventure and exploration. I missed it since Northrend.
I have had a few favorite things about MOP so far lets see: I really like the pets battles with all the different pets and combinations you can use for your party, the rare spawns have been really cool I like the challenge it has been to kill some of them while I level through a zone, and I am excited about the new way to get hunter rare pets.
I absolutely love that I can capture new wild pets with the pet battles and all the new pets that have been introduced. I also can't believe we ever lived without AoE looting.
All new elements in wow, e.g. pet battles, your own farm, accwide achievements, etc...MoP is a fine addon atm, i hope i can say that after we've killed garrosh.
My favorite part of MoP has been the heroics. I had a lot of fun when I farmed them in the start of MoP and finally got my Red Cloud-serpent
AoE looting has to be the best part by far!
What I love most about MoP is the environment and the lore! Battle pets are fun too, I am addicted to them >.<And I can't forget to mention AoE looting.. I have the compulsive need to loot everything that sparkles and sometimes I am still surprised that I don't have to spam-click all those corpses anymore :D
Pets pets pets! I'm going nuts over these little guys! You might say I... gotta catch all of them, or something like that, yeah.
AE looting and account wide achievements
The take-a-yeti-on-a-rampage daily quest in Kun Lai Summit, because it reminds me of Gnomebliteration.
definitely pet battles
i love the new world, aoe looting, dungeons, weapon upgrade system and the new warrior and classes in general now it seems every class has a cool Aoe as opposed to previous expansions although they still seem to have balance problems id definitely say this is the best expansion.