Premades already ruining ranked.
My first ranked game with this new matchmaker was a 3 man premade vs no premade on my team. Spoiler alert, we lost because the premade roamed everywhere together and TP ganked several times. If you are going to add this feature, DO NOT let there be premades on one team and not the other. This is a joke. As it is even if there are premades on both teams it totally ruins the game for the random they are matched with.