current Ranking system is... pretty flawed for how things set up at the moment.

In 1v1 pvp games, would be totally fine.
In 5v5 preformed team pvp, also completely fine.
In 5v5 solo que only, completely abhorrent.

mainly because in the first 2 you have full control over how you are approching things,
if you are worse than the opponent, you lose, if you are better, you win, simple.
yoyoing is boils down to skill and only a small portion of luck

with the solo que however, you can throw that all out of the window, as you just have only 20% control over your teams performance and have to pray to Rngesus for the rest.