Wayyyyy too much focus on grinding.
Anyway onto the quests. I would say 70% to 80% of the quests is "go kill 20 of " or "go get that drops from ". Instances, you need to get reputation to get into various end game instances which means more grinding.
Despite all this there are still some good stuff. I mean flying mounts (costs a bunch of money though = lots of grinding again), socket thingy (jewelcrafting), 2 new races and lots of lands to explore is quite nice.
My conclusion:
I feel Blizzard made a lazy effort to make the gameplay more fun and it seems they just wanted to lengthen the time you need to "finish" (what you wanted in) the game hence all the focus on the grinding. I used to be a big fan of Blizzard because they always made the quality games but for the first time I feel a bit cheated.