Before I do, though, I wanted to mention a couple of places where they did improve things. Cooking and archaeology, two of my least favorite things to do in the game are much less painful, and so kudos to that. I'm told fishing is better as well, but since I'll never ever fish, I'll just have to take your word for that. And now, onto the firestorm of complaints!
1 - Daily Quest Randomization
As much as I personally hate daily quests (it rhymes with 'Pike Ire') I will admit that the implementation on most of the new daily questing for factions in Mists of Pandaria is probably about as well implemented as it could possibly be, and as such I've chosen to focus on an aspect of the implementation that I think is more hit or miss than the rest. That is to say, the way it's determined which dailies you get in a specific day.
This is something I notice with every faction but I'm going to pick on the August Celestials because they're the worst about this. I have two level 90 characters working on rep. I have now defended the Temple of the Jade Serpent for four days. I don't want to defend them anymore. Please, for the love of Zod, put in something that checks to see what quests you've done over the past five days and doesn't give the exact same ones to you again, I'm begging you here. How about Niuzao Temple? I'd happily go defend that for a change of pace.