Solo Que should be based on personal K.D.A not win/loss.
That way feeders Go down,
And players who are good/work as a team go up.
Relying on 4 other people to increase your personal rating seems very unfair, since you never know who your going to be playing with ( annoying guy with 999 ping, cool man. )
I realize people will say something like 'my score is a representation of my teamwork"
It would also cure this ridiculous (in my opinion) support only buying ward thing.
Everyone should be warding there lanes.

My humble opinion to try make the game better, Peace.