Their matchmaking sucks %%%%.
I started playing on my other account and I don't know where they pull these biggest of turds from but every other match I have, I am the only one taking towers and getting a positive KDA while my bot lane seems to never top feeding any my junglers hardly have an idea on what a dragon looks like.
Here's my account - https://lolprofile.net/summoner/euw/haze97#update .
Till yesterday I was still closer to a 50% winrate, and if you take a look at my history I am personally doing better than most of my teammates. Taking towers, raking up farm, itemizing correctly, etc, but I keep getting matched with such idiots I end up losing the game because they would rather prefer jumping into a 1v2 and dying while you have super minions attacking the base.
I am done with the shitty matchmaking here. Call me when they stop paring people with braindead turds who lack basic decision making and pair my teammates with people who they can at least go even with.
Don't create a competitive game if you can't get your matchmaking right.