So I hit 80 midday Wednesday before Thanksgiving nearly 2 weeks after release.
So far, I am just totally blown away. I have spent the time sense leveling my professions, running dungeons, doing some dailies, and (my new addiction) getting achievements. My guild has dubbed me resident "Achievement Whore."
This expansion has completely revitalized my interest in the game. Even PVP is fun for me now with the new battleground and Lake Wintergrasp.
Sure, there's still a grind involved with it but that comes with the territory. It wouldn't be a proper MMO otherwise.
I'll leave it on this note:
DK's are OP. If you play the game you'll know what I mean.