> I think you could might get decent results on this by having each player rate the others at the end of the match - but you don't use the ratings to rank the p

> I think you could might get decent results on this by having each player rate the others at the end of the match - but you don't use the ratings to rank the players, instead you'd use them to cluster players based on who they mutually like to play with. Dota has a system like this called "behavior score". I know it works based on reports, but it might include other things like text analysis or item feeding. It seems to work pretty well.