Matchmaking is awful in this game. The reason being is because they have winners que and losers que. Matchmaking tries to keep you at a 50% winrate. Instead of upping your elo to do this, they decide to throw you into games where you are 90% predicted to lose or win the game. Ever won multiple games in a row to then go on a massive lose streak? That's why. They don't care about your experience or if you have fun.