I don't think point 3 is quite fair. There were some new ideas thrown into the game.
The issue is those ideas were not fun, or very badly implemented. I believe it was the ranked mode, where if you won the round you were then locked out of playing that character again. They also had you build out a collection of characters to pick from before the game started.
There were some new ideas, I just don't know of any that were good and added to the game. The only ones I know of seemed bad(or at least badly implemented) and took away from what enjoyment people had with the game.
The choose N heroes things is also in deadlock. They require you to choose 3 and you're given 1 based on preference and queue time. Can't be a1-trick but you can usually get the same hero each game
I don't think you can compare the deadlock and concord mechanics. The concord one is more like, congratulations you won a round with the M4 in CS... You can no longer use the M4 for the rest of the game.