I don't recall such a list. I would think that the owners of this site would open them self's up to legal action by having one. While posting a bad experience in the open forum might be ok (?), having a compiled list might not.
You can also do a search on the name of the person you are interested in. If he doesn't appear in a bad light try looking at the posts he has made, is this a hobby for him or did he just appear out of nowhere?