I speak only for myself and the people that joined me, but for us? WoD was the best expansion we ever played. Not because of the expansion itself, but because of what we did with it.
We spent the entire expansion ganking, and warring with other players. We got our whole server dragged into a sort of PvP war that lasted for the whole expansion, spread to towns, rekindled old rivalries, and helped us make new friends and enemies; the server hadn't been connected like that in such a long time. It reminded us of our time in vanilla. All of the combat items lying around, craftable, and grindable. All of the best little tricks, and abilities, and rewards for WPvP. For me and my friends it was the best expansion we ever played, and were sad to see it gone.