As mentioned in many ways, features such as dungeon finder, or Lv sync are ONLY problems, if they arn't handled properly. (I mention Lv Sync because of the arguments being the same.)
Not because it's impossible to make them work.
With games like WoW, Dungeons, quests, and PvP are the only real content, and only 1 of the 3 asks for exploration, and isn't as fun/quick.
And as explained many time in the Lv sync thread, the problems we mainly see lie in the limited or terrible "Base game" and lack of effort to fix or change it.