Do average duck hunters suck you ask? I can't speak for their shooting skills but I have been able to observe over several decades that many have a lack of ability to estimate range, or they are just desperate.

Game shooting does not provide the opportunities to shoot enough to become proficient with a shotgun. Clay pigeons; Skeet, Trap and Sporting can provide the ability to learn to mount, evaluate the path of the target and make the move to hit it. Those games still can not provide the same experience as shooting a live bird. That is why I enjoy crow hunting, lots of inexpensive time in the field shooting a lot of live birds during a very long season. If one can kill 50 to 70 percent of the crows he fires at he is a good shot in my experience. One of the nice things about crow shooting is the ability to learn how to hit long shots with full choke as the use of full choke at close range is of no consequence as we are not shooting the birds to eat them.

Oddly enough one of the best wing shooters in the world is a crow hunter.

http://www.youtube.com/watch?v=5Cn6MEymVXk