Being fair, while I think Warlords was the least successful of all of the expansions, if you were primarily doing high-level raiding it was fine. If you weren't then you would lack for things to do.
It's quite amusing to see a few people here who have been out of the game for more than five years--"walked away without ever looking back" is how I think they put it--that are still here posting regularly because they imagine they have something new to say. That can't be healthy.