How come riot expects us to play to win when they match us with totally different skilled players??

Im not saying enemy is stronger everytime Im not saying my team is autism everytime ALL Im saying is the skill level of players in my team and the enemy team is always completely different from mine, its weather the enemy is a lot stronger, or the enemy is a lot weaker. While theres barely anyone that plays as much as me (sometimes I find one player but its rare), the only way the enemy wins is if my team is completely handycapped. WHY is this such a different skilled players being matched together????? Stupid matchmaking.
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