I know exactly what you mean. A lot of the truly great porn is amateur or enthusiast efforts. Unfortunately, since there wasn't contracts etc its also the most vulnerable to people acting against others will. Sucks that we lose a lot of great art because of moderation, but also moderation is 1000% necessary.
For my part I've mostly moved to erome, imagefap, and gif sites. I haven't really found the niches that used to bring me back to motherless, but there are occasional gems.