What is wrong with matchmaking

I had several games today with a lot of new players, that resulted in either being stomped cos they fed their laner opponents or me/other "not so new players" stomp em. Im gold 4, played this game a lot, I dont see how I can be matched with levels 22 etc. Plus this new players trashtalk me about toxicity when as a jungler I just ping backoff and stuff like this, not enjoyable games as I got a lot of random reports. What is wrong with matchmaking...
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