@arma473 Hey this looks like what happens in some of my games anyway! But yeah you're 100% correct, this'll just make that issue that much worse,
@Zukko Unfortunately I really don't think there's a way to implement such a system in a way that isn't going to lead to more cancer in games instead of less. There's a reason why there's nothing like this in other team games that I know of, people will try to game it for rating and care more about getting rating rather than actually winning as a team.
What about a system for you to freely give a point to your teammates for being good teammates after a game? Getting a certain number of points could lead to getting an avatar or some other rewards. Sure this will be gamed, but at least I don't think it would lead to more cancer unless I'm being naive or missing something.