I've yet too run into a bad healer,but I always run into horrible dps,or a dumb tank.
This demonology warlock was pulling 1.2k DPS in heroic Pit of Saron,they were using a imp yet they had a point in felguard,then the next I got into another heroic pit of saron,we got too ick,krick and this hunter was standing in all the toxic waste,wouldn't run when ick pursuited him.
The only way I've found to not get bad healers is to heal :]

