Question: Why are ranked games/matchmaking so unfair?

Why is it that after winning 2-4 ranked matches in a row im being matched against such unfair enemies every single game for another 3-5 matches? Quick example from today. 1 decent ranked game, next one is against 100% win ratio, lvl 33, kindred jungler .., game after that, 80% winrate fizz smurf mid, few games before that, adc in my team, apparently p1, had almost no knowlege of his champion and position. How is it that always after winning even a single game i get games in which my team is stomped so hard it makes me feel like leaving the game, but it never is the other way around ? What changed in matchmaking for it to be that bad?
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