DPS queues are cray, even for earlier dungeons. Tank or healer can land a party in seconds, DPS waits forever. I usually am healing or tanking so what I usually do if I need a dungeon is to ask in /say or /shout before going to Duty Finder, pick up a pair of DPS that have been waiting around, then queue up. This only gave me trouble once, was healing, landed two *very* bad DPS and one who was AFK nearly the whole run and then rolled greed on every single piece of caster gear (that he didn't deserve), which was pretty irritating, but otherwise I generally end up with a couple of really thankful and nice folks that way.
