In the "higher elos" the skill gap between players in diamond to immortal is almost non existent. It seems like a lot of players are being passively boosted to higher ranks through 1 or 2 players carrying.

There is almost no balance in matchmaking. Having a previous act rank of plat 3 then suddenly that player is immortal 2 the next act is hilarious. That previously plat 3 player should never realistically be able to achieve the 3rd highest rank in the game in that short of time.