What is this matchmaking???

My friend and I are a duo literally haven't played in years and for some reason all we ever play against is triple stack former preds/master players when we are literally in plat and gold lobbies. Why are there such high ranked players in such low lobbies? the game is non-enjoyable and unplayable at times. Please fixing the match making, i literally along with probably thousands of people who would spend money on the game will quit once again.