All in all I am enjoying it. Wrath is still my favorite time in WoW by a long shot. But this isn't bad.
Gearing once you first hit 90 feels really grindy because they aren't just handing out gear anymore. But I like that part of it a lot. It got really really easy in Cataclysm.
Pandaria is a really neat place. The raids are nice looking. They added new arenas and battlegrounds. (I like 1 of the new bg's, the other not so much).
Shared achievements between your characters are really nice to finally have as well.
Shared achieves, thats awesome! I used to hate it because i had a tonne of different achievements on my Druid and Paladin and really wanted to combine them :P.