My favorite Duty Finder experience was back before roulettes, where I queued up for one of the dungeons needed to advance the story into a dungeon with 2 dps because the tank and healer bailed on 'em. I healed the dragoon until a buddy of mine came in as a tank. It was great! I'd love some sort of 'distress beacon' DF thing where people could put in because their group is falling apart.