User blog comment:Leyrann/Placement Matches - The toxic that creates the Elo Hell feeling/@comment-4.49.113.10-20121127203235/@comment-4834593-20121129142804

As the OP said, at least 3 people have to up or downvote a player, meaning that duo queue can't lower your elo because they're mad at you.

And this is in addition to the normal elo gain/loss, I'd say, so nonvoters are no problem.