User blog comment:Leyrann/Placement Matches - The toxic that creates the Elo Hell feeling/@comment-4.49.113.10-20121127203235

The problem with basing Elo on KDA is that more passive roles like support (and in some cases the jungler) will get shafted. That ADC with 15 kills probably also has a lot of assists, and in all likelyhood fewer deaths. It doesn't necessarily mean that the support or jungler is less skilled than the ADC - quite the opposite in fact. Getting your carries fed is awesome. But they would gain less Elo anyways.

I would propose a system similar to honor, so at the end of the match you can upvote good players and downvote bad ones. If say 3 or more players downvoted/upvoted another player, their Elo change would go up or down (i.e. for a win an upvoted player would gain more Elo, for a loss he would lose less.)

This way, even if some trolls were in a duo, they couldn't downvote everyone to lose them Elo, and the good players would be able to climb out of low Elo more easily, and negative players would go where they deserve.

Who knows, you'd have to try it and see if it was abused. But it could work.