This bullshit experiment of incompetent high school dropouts..cough I mean, RIOT's "lead matchmaking designer" (according to the roundtable video) is, as they claim, in 99% of the cases right in "Low Elo".
Nobody of my friends play this bullshit, they switched to Blizzard.
I just stay because of my over 6 years here and I like the style, but I haven't ever seen a worse matchmaking that is already broken on paper.
Whenever a personal rating is based on 80% of others, you know this rating (the MMR) is worth shit.
Now it becomes even more wonky: I am not only on the mercy of my shit team mates, no, they also queue whetever they feel like. And because that troll bullshit is not terryfing enoug, they get handicaps going on. So it's a bogus number (MMR) that does not reflect actual skill but luck (e.g. rolling dice works better than this "matchmaking" of this game) and in the end even on how much fucked-up and boosted your mates are. If you win because of boosted enemy trash players, it's the same MMR-distorting nonsense just the other way around.
On the other hand, it's Murrica: The land where nothing is impossible.
In Germany, we usually fire people who fail at their jobs like this, in the USA, you become game designer...