it's funny. i recently came across that site too. i wasn't on it luckily, but i have really only left bad feedback for 1 person recently (in years) though. this is because she was a total scam and i was trying to prevent people from talking to her. otherwise, i don't normally leave bad feedback. primarily because i haven't been calling random people (mostly only people i've used prior, until i found this site and tried new people you guys recommended), so there is nothing negative to say. or 2, i get apathetic. i feel sometimes, what good will my negative feedback do? so i usually just keep my comments to myself and not call back.
anyways, i think it's a funny site honestly. i guess it's the readers chance to vent, and alert others of possible bashers. but it just comes across as complaining in most cases.