This disease is called preseason. I can't even count how many terrible compositions I had in my recent ranked games. People don't give a fuck anymore, even on higher level. Everyone knows that there will be a soft elo reset and picks stupid champions. I had recently jungle Syndra picked along with squishy top against team with Malphite and Amumu.
I guess there is nothing you can do about it, just pray and wait for next season.