One way to get a handle on the validity of the feedback is to check the feedback on those who have left feedback. And also check if the same people show up as the only ones leaving feedback for each other. I would also recommend a phone contact for anyone without impeccable credentials. I should also point out that in about 25 transactions over the last 2 or 3 years, I have only had good experiences so far.
Feedback system flawed?
Have you ever had a terrible experience with a member with a huge positive feedback rating? Have you ever read a feedback that is a lonely negative among many positives? Do you usually discount that lone negative feedback as a person with a chip on their shoulder? Thoughts and comment are appreciated.