While I agree the questing is pretty detached, it really is just an xp injection layered over grinding (which for me is great honestly, I never read quests anyway.. not in any game) I don't agree that it is alone in that. Most games, aside from TOR, are very detached from their questing in this regard and based on how WOTLK played out (people stuck in different instances of the world from each other etc), frankly I think that is not an all bad thing.
All in all, as I have said before, the combat is amazing fun, it is the first game I could see myself just leveling to the cap grinding since EQ.