No freaking no
As a certified sociologist (or at least I´ll be in a couple of month) with a specialty in social differentiation I want to avoid anything creating an over- and underclass here.
User ratings are communication reducing mediums. Instead of forming your own opinion on someone based on your interest you get a very reduced "opinion" served by the "community". But that doesn´t tell why
that person got the ratings he did. I could give Roger_Rightwinged zero stars because I disagree with everything he says or I could give him four stars because he is a good debater. The stars wouldn´t tell why he got it.
This is only a fraction of the reasons why we shouldn´t have stars here so please please PLEASE don´t do it.