The major drawbacks to me, so far, are the following.
- Shado Pan dailies suck worse for a healer than any daily hub ever made. Literally. I did dailies in BC as holy and that wasn't even remotely as bad as Shado Pan as a healer. It's freaking awfultastic.
- Rep is too small for most things, rep is too big for Tillers. I'm nearly exalted with the Tillers and per day I gain no less than 2k rep off of six dailies. I gain 800 for Shado Pan a day at honored, and not much more for Celestials per day. I understand you want to sort of slow down the vendor purchasing a bit, but this is beyond ridiculous. By the time I unlock these two vendors I'll probably be in TIER gear. It seems Cloud Serpent is awfully quick like Tillers, as well. So, how is it that two reps that give you mounts are super fast, and the other reps that give mounts at exalted are incredibly slow? I don't understand this at all.
- Justice is 110% worthless. There's absolutely zero point to Justice points. It buys gear that's lower level than what you're getting the points from. It makes no sense. They may as well just designed heroic bosses to give 5 Valor like they're a daily quest instead of Justice, since the gear from Justice points is for gear that is supposed to get you ready for heroics and not for raiding. I thought the point of Justice was for pre-raiding gear, not pre 5-mans gear. Now instead of heroics/JP transitioning to raiding/VP, JP transitions to heroics transitions to raiding/VP. They made the JP system completely separate from heroics, but still give you Justice for doing heroics anyway.
- Daily "requirements". It was silly to make Golden Lotus the be-all standard to even unlock other reputations.
Their ideas for gating are understandable, but in themselves incredibly frustrating. I am also loving the expansion (pet battles are the best thing ever put into the game and I want MORE SUPPORT FOR THIS PLEASE AND THANK YOU), but some of this stuff is incredibly frustrating and I can sympathize with that sentiment.