I have no idea if that exists, but hit me up with it if you do find it.

One of my artist friends says that Artists-Beware does have some commissioners-about-artists stuff, but idk, it feels limited. I agree having a site dedicated to rating artists or something might be pretty good.

Sometimes I kind of debate posting up my interactions with artists I commission just to get their names out there and push some of the less-decent ones to do better.