This matchmaking is a God damn joke.
I know this is quite anecdotal but I honestly can not take this match making seriously.
Here was my last ranked game which Riot expected me to win I suppose.
My Team Top: Silver 4, 37% winrate 31W 53L JG: Bronze 1, 40% winrate 6W 9L Mid: Bronze 4, 38% winrate 22W 41L ADC: Silver 4, 50% winrate 16W 16L Supp: Bronze 3, 50% winrate, 4W 4L
Enemy Team Top: Silver 3, 59% winrate, 79W 54L JG: Bronze 1, 60% winrate, 58W 40L Mid: Silver 4, 54% winrate, 62W 54L ADC: Bronze 2, 56% winrate, 19 W 15L Supp: Silver 4, 53% winrate, 18W 15L
Like I am no professional but this looked like a lose simply in match making.