Its been the norm now that you usually need 2-4 map queues before you get into an actual game because theres always someone who just Alt + F4 the map he doesnt like but cant cancel out. Together with random drops it often takes 30-40 min to get into an actual game.
A huge time waste and border for new players. Either increase the bans for maps to single players or punish players for actively screwing the queue with Alt + F4 by giving a time out to queue ranked games for some time. Increasing for each queue quitting on purpose.
The game is held down A LOT by those issues which have been solved by many other games since ages.