An interesting idea, but as yC said already, the idea could be easily abused. You would get people purposely going out of their way to get rival servers a "blackmark", including submitting fake chat logs/edited screenshots.. etc. In the majority of cases, we wouldn't be able to prove whether these claims are real or not. I prefer the Hall of Shame system we have now, where we let the users of RMS judge each server report.
Also, you'd be surprised how many people probably visit the Hall of Shame here. There's always a large number of Guest users on RMS who browse around the forum without registering.
Overall not a bad idea, but I'd have to vote no on this one, sorry.