Normals Matchmaking system is broken

I don´t know if this happens to you, but it´s happened to me enough times to see a very clear pattern that makes the game super unfun and obnoxious. Games being one sided have been part of 90% of my match history since season 4, but it´s happened so many times that now I know what team is going to win no matter what. There´s 2 very extreme outcomes, you either go into a winning streak for about 6 to 10 games where you stomped the crap out of the other team in 46 to 12 kills games, or the opposite where you get 6 to 10 games where you are the one being crapped on. Idk if the system makes it so that if you win constantly then you get abruptly placed with tilted/raging people (also otherwise if you lose a lot) or this is just a coincidence that has it´s own entity. I´m so tired of games being so one sided, I´m not having fun when losing, I´m not having fun when winning, I´m just not having fun at all.

I have reasons to believe that riot makes this intentionally, when looking at the overall stats of the players i end up noticing that, when in losing streaks, my team usually formed of a bunch of silvers with 300 normal wins and some other guy with 1.5k+ wins that is usually me, while the other team is composed of Gold and platinum players with 1.5k+ normal wins and maybe one silver with 500 wins (Again, this also applies to the when i´m winning). Now, you may say "But your rank and amount of wins mean shit", well maybe, but it definitely helps; also, what a coincidence that the silver team gets always beaten by the gold teams, it´s probably just a coincidence, it surely isn´t due to the fact that higher divisions have greater chances of having more knowledge over the game while having more experience with their obvious 1k difference in normal games played. You can´t tell me rank means shit when you have evidence of gold and platinum teams statistically winning more than silver and bronze teams, that´s just ignoring the facts and going by causalities, which is just dumb.