My solution for ranked
If you get 0 kills in a match you should get a warning, and if you do it again you should be forced to play 5 normal matches before you can play ranked again.
Thing about it, the feeders and trolls often go 0/something/0 or 0/something/something.
Or better yet, have it be ratio. So if they get 5 kills but die 20 times...guess what? WARNING and then back to normals if they violate minimum performance standards
And we all know that not getting a single kill in a match its hard to do if you are truly trying.
Lets punish those who want to play stupid in ranked and waste everyone's time. Force them to normals if they want to troll.