why has match making been so horrible these last few days?

Im fed and i carry my team but we still lose the match, next game i play decently and so does 2 others on my team but we still lose, the match making as of lately has been horrible, the game sits in que waiting to launch until it finds a team that's setup pre made to counter my team 80% of the time so im losing 4-5 games before i get 1 game that's marginally more balanced that can go either way, and most times my team meeks out a victory in that kinda of match. Then the next 4-5 games im forced to just sit and lose the game cause its one sided cant do anything to fight back kind of games. So basically what im saying that the balancing for matchmaking ratio is off balance and needs fixing. To make a point as well there are days were i constantly win 1 match after another for like 6 games in a row, now i feel that to as fun as it is for me has to be frustrating others, so if balancing can find a good medium between winning 6 games in a row and losing 5 games in row the next day to say losing 2 then winning 2 that would be way better for balancing in match making.