Woah now, I wouldn't say most of it is crap. We have rules that filter out the worst stuff pretty well, after all. I'd say "mundane" would be a better word, because even if it's better than anything I could ever draw, it could still be common and boring. There's no reason to reject that type of thing, though.
If you only want the masterpieces, just browse the gallery picks folder.
As a contributor I would like to be able to put down more than one piece a week BUT as a watcher, there are more than enough submissions. If not, then too many. So keep it where its at, I think its pretty balanced where it is.