It also had huge lulls in content release. Dungeons in wotlk were piss easy but they still rewarded you with stuff so it became rewarding for you to do it. Dungeons in cata were harder (although not very much so imho) so it was a bit more personally rewarding to overcome them and they still gave you lots of goodies. Dungeons in Mists are not only easier than wrath they have less reward than in any time in the game short of vanilla. It's worthless and to easy. It is the least rewarding experience I've ever had in the game dungeon wise.