User blog comment:Leyrann/Placement Matches - The toxic that creates the Elo Hell feeling/@comment-5266525-20121127191115/@comment-5266525-20121127233232

Well, even then, you have problems. I recall reading a TrueSkill vs. ELO thread on the forums a long while ago (I can't find the specific thread but there are lots of others out there) where the proponent cites the very same things you're suggesting. That was promptly shot down by opponents who made it very clear that there is absolutely no way of quantifying everything in the game that defines good play.

The guy gave a pretty good example of a Singed who splitpushed bot and successfully diverted four members of the enemy team so his own could do an uncontested Baron and take several towers. In terms of raw data, all Singed did was kill a few minions, but in reality he just might have been the most contributing member of the team.