Why do I get unranked people in my games?

I just played a game around silver/gold elo. I had a master yi top. We were versus 5 AD champions. He rushes hexdrinker and tiamat. So yeah, thanks for the bronze V teammate in gold. Really good call. He got ultra stomped and we lost the game. Oh, I also had an unranked jungle. He got ultra stomped too. Basically I just lost LP 100% because of moron roulette. There has to be a better way to place these people.
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