Sadly the symptom of a wall to wall pull is because the dungeons offer little to no resistance to the players. There is little fight back or challenge in its completion. And thus the default setting for most players is to rush things. Do it as fast as humanly possible.
personally I believe this is due to the competing aspect of it. If you can pull off a dungeon in 15 minutes where others do it in 20, you will feel better about yourself and be a winner.

And I agree with the initial post of this threat. It would be nice to have groups that played the dungeon as the dungeon as meant to be played. Sadly that will not be while they are walkovers and flavorless. So my best idea for the Devs is to make it a challenge. Make fights that will have players stop up and have to think about their fight, instead of just mindlessly rushing it because they can.

So lets hope that dungeons will be getting a little bit of love in the future, so it don't turn in to a WoW dungeon fiasco where they where all lame and uneventful.