I've been teetering on writing something for a while since I was a major hater from the time of it's announcement.
I played until around last month. I quit because frankly, it was boring. I hated the Pandarens and barely got past them. In fact, I probably didn't entirely. But I still played the game with my Guild and enjoyed my time there. Everyone is correct in saying that Pandaria was beautiful; but there was too much emphasis on alcohol. Not that I care about the morals behind it, I just felt they shoved too much of it down my throat. For example, there is a dungeon based on it, one of the towns has almost nothing but a Cooking Trainer and the rest are all alcohol vendors. I am probably the only person who got sick of that, but it was there. And there was too much of it. I like when games include it, but I hate when things are hammered in so hard it bleeds me, you know?
I have played WoW for 8 years now and it was a bit of a sad thing to quit, but it got so tedious and boring that I couldn't take it any more. I played all aspects of this expansion. I did my Dailies every single day until I hit Exalted with everything. My Guild quickly and efficiently ran through all content that was currently available and I got mostly all the gear I could get. I was of the top 3 most geared Druids on my server. But at the end of the day, like everyone is saying... It is still WoW; and this particular expansion got boring far more quickly than the others. It didn't have the momentum to keep me interested. I thought there were some fun additions like the Black Market, and some of the boss fights harkened back to the old days and made me really happy.
However, this all got very old very quickly. Unless the Emerald Dream expansion comes out, I won't be returning. I very much hate a lot of what it's become, even though some aspects have been far and away improved since the old days and even last expansion. I do like Pandaria a lot more than I liked Cataclysm, but it doesn't have the drive to play. Maybe it's just me and things have become old, but I have heard many players say the same.
That's all my two cents, anyways. If you want to buy on visuals and base gameplay, then I would recommend it. However, if you get bored of tedious things; including a tedious endgame, then I would vote against Pandaria.