seems the most obvious question hasn't been asked.
Ever since 2.2 we can see the average wait time for melee and ranged dps separately. If I am on drg, or mnk I always have an average wait time of under 6 min and rarely wait more then 3-4. If switch to blm, brd, or smn they have a 15-22 min average wait time and usually wait 30+ min for a dungeon. This is the number one reason people ussualy have long waits, they don't realize that ranged DPS get hard core raped by the way df prioritizes/sets up party.