I usually just leave and level crafting. it's more fun and efficient. Especially if the DPS suck ass which is about 50% of the time. I don't even wait for a wipe. If I notice the first boss is taking forever to die, despite my DPSing as a healer, I'm out. Don't even say anything. I just abandon and go craft, re-queue in half hour, rinse and repeat. Usually after 2-3 abandon and re-queues I get a geared group that just speed runs the dungeon.