DC played great at the start of the season. They got some great wins. I don't know what happened to them at the end of the season. After the performance of the whole team broke down a lot. But they played really great against SRH. If they hadn't lost early wickets in the final, I think the final would have been competitive.
DC was one of my favorite teams, because they had the largest contingent of young Indian players, in Shreyas Iyer, Prithvi Shaw and Rishabh Pant. But they were unable to maintain the momentum. And in more than one occasion, they lost matches which they could have easily won. I would still say that they were unable to win the tournament, because the players cared more about their individual records.
No doubt DC is a team of young players but they have shown in this season that they are very inconsistent. About Prithvi Shaw I do not understand why he is part of a T20 team. He is not a guy who can start hitting the ball from the first ball itself he needs time to settle. In my opinion he is one day and more of a test player.