ARAM Ranking System based on Individual Performance

TL;DR;

See the title ;)

Long version:

Very often I find myself playing ARAM with people that seem to not care about winning the match. They usually just make silly plays, feed the enemy team - end don't even buy defensive items to stop it -, and just laugh about it, since there is no negative consequence on doing that.

Although I'm not a very competitive person, I do like to play and win every match. Therefore, it is really annoying to play ARAM when my teammates are not as committed as I am.

To solve that, why not having a separated ranked system for ARAM? And since it is a game mode where strategy is basically getting ACEs in order to push the only lane, and team comp is a matter of luck, why not use one's personal performance - rather than the collective performance - to rank them?

One could argue that the randomness nature of this game mode would create an unfair advantage/disadvantage depending on the champions arbitrarily chosen, but that's the beauty of this system, been able to do well no matter what champion you get. And also, I've seen lots of supports and tanks - , , , - getting some really, REALLY nice KDAs in this game mode (APC , anyone?!?)

So yeah, why not Rito?

PS: If you don't like playing ARAM, or if you do, but do it mostly in order to try new chaps, kill some time, or just have some fun playing carelessly, please, don't bother yourself ;)