Easily, my favorite part of MoP have been Scenarios. They're a quick little dose of content without the massive queues needed to do 5-man group content. If I don't want to dedicate the next 30 to 90 minutes waiting for and completing an instance, the option of a scenario is an awesome relief from the waiting game.
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pets, pets, and more pets. im a big collector and the way we can change there names to make them more personal is a big plus. :)
My favorite part of Mists so far would have to be the rare items hidden across the continent. Gaining "the Relic Hunter" title has been the best part so far. That and all the BoAs i farmed getting it lol.
I've got to say my favourite part is getting back to raiding with my guildies; there are some interesting new mechanics and twists on old classic ones, plus everything looks gorgeous.
My favorite part about MoP are the talents and glyph changes, so that Fury is much, much better in PvP.
My favorite part of MoP is definitely how they encourage us to explore the world and not stay in a capital city.
My favorite part of MoP would have to be the endless amount of content we've been provided with. Specifically, pet battles :)
the pet system, pokemon? i love this
The amount of dailys have having the option of doing them or not
I like the story and the legendary quest line. It feels more engaging and finally gave me the feeling that I'm a small part of something greater.
general storyline. and ability to train a mount.
My favourite thing is a pet battles is really nice to actually have a use for my pets other than to just look nice :P
Strangely farming motes of Harmony from halfhill