I'm getting really tired of running a quest only to find that it cannot be completed due to some bug, then waiting for a GM to respond, only to be told that there is nothing that can be done.

Turbine, you keep closing quests that have a bug that makes completion too easy, that allows players to skirt some challenge in the quest. CLOSE THE QUESTS THAT CANNOT BE COMPLETED!

Just close them! What point is there in leaving it open if it cannot be completed? Just to frustrate your already irritated player base?