Why can't we see our own Ping in the client? Before we start a ranked game???
There are three things I hate in League that aren't Kennen.
People who are so damn bad and feed in my ranked games. Kennen. People who are lagging really badly, all game long, from the beginning to the end.
Now I know you can't make people stop eating ass, and I know you refuse to give Kennen the treatment he needs, but you can EASILY warn someone that their ping is -ahem- off the hizzle.
Just in the top-left of the client screen, where the big PLAY button is, just put people's current ping there! If they have 300 ping, they can see it before they find a match, and thus prevent four other people from losing LP because of it!
I know there might be the problem that the current client is ALWAYS a laggy piece of shit, and that might affect the results. But at least do something!