Hussar
Legend
That's the point though. There are TONS of reasons to play with jerky DM's - it's not like you know they're jerky beforehand. And, geography in the past played a huge role. If that's the only DM in town, well, you have two choices, step up and run games or play with the jerky DM. And, that's ignoring personal issues where that jerky DM is actually a friend and then it becomes even more complicated.It feels odd that DM ability is a bell curve centered on ok, but you keep jerky ones...
I polled En World many years ago about people's experiences with DM's. Obviously unscientific and all that, but, the results did graph almost as a perfect bell - about 1/4 reported having bad DM experiences, about 1/2 were okay and about 1/4 were great.
But, if that number holds true, that means in your group of 5 players, one of them or possibly two (presuming they're not all new) has had bad experiences with previous DM's which will obviously color their perception of the game.
One of the bigger mistakes I see a lot of DM's here talk about is this automatic presumption of trust. Trust your DM is the mantra when it's really not warranted. You need to prove to your players that they can trust you. One should not automatically assume that your players are going to trust what you're saying just because you're sitting in the DM's chair.