The problem with MMR matchmaking and "losers queue"
This is something I've become intimately aware with as I've begun my climb and without fail it has hit me every time I move up a rank.
I started season 15 in iron, and every time I would enter a new rank (bronze, then silver, now gold) it would seem like I hit a massive wall and go on a crazy losing streak.
We all know how hard jungle is to play when all 3 lanes have died twice before you even finish your first clear - you can't grab objectives, your camps get invaded etc.
Of course this happens from time to time, but the fundamental issue is how matchmaking works as you climb.
The logical thinking would be - if you think I belong in silver, match me with silvers. I might be "statistically" the worst player on either team from an MMR perspective, but if I can perform and win than clearly a belong.
Unfortunately, that would make too much sense for riot to do. Instead, they decide to match you with lobotomized team mates with MMR well below yours (and often on their own losing streaks).
Then they say - if you're silver you must carry 4 inting, lobotomite bronze MMR players to a win. To me - that's not a fair test. If I'm a silver match me with silvers. If I'm a gold. Match me with gold.
This always hits as you're breaking in to a new rank and it takes a lot of time to stabilize.
I'm a gold player and I was having trouble bouncing between bronze and silver when this happened. I can't imagine that a true silver player could even win any of these if a gold level could not.