Now, without going into the major issue of competitive being forced 2-2-2, we do need a fix ASAP for this situation:
When in queue for 10+ minutes as DPS, you join a game, and someone instantly leaves. Everyone is kicked from the game, and you can now re-enter the queue for another 10+ minutes. When this happens you MUST GET PRIORITY in queue.
There’s no discussion here. It just needs to be fixed.
It has been suggested many times before , but they just don’t care.
You do get prioritized when that happens. There are just so many others that get prioritized too 
where does this information stem from?
It used to be shown on-screen when a match was cancelled, and the queue-time didn’t change when that text was removed later on. I have a hard time imagining they removed the functionality because of role lock.
I think better choice would be to those who leaves game by own choice: long ban and if it happens a lot -> even longer ban from competive.
And if the player leaves early stage (now match cancels)
There would be few mins warming time while new player is searched and after that the game begins, simple and easy solution.