I am tired of exclusively encountering teams of people that only ever engage in 4v1 and 4v2 entire-team gankfests, and I'm sure I can't be the only person that would appreciate some kind of player rating system.
As in: let me see a list of players from the last game I was in, for both teams, with ratings for things like teamwork and dishonorable combat. Keep the people who gank matched with other people who gank, and let the people actually playing For Honor play together.