I don't think Mickey has proven himself to be a good coach in the shorter formats. Coaches should be judged on four things.
1. Does there presence improve results? His presence has not produced good results in One Day Cricket. Pakistan is still playing the same style of cricket it did when Waqar Younis was the Head Coach. Even though we are winning T20 Matches, we are winning playing one way. In the long run this will catch up to Pakistan.
2. Does he improve players? The answer to this question is a resounding no. Mickey has not improved any player. Each and every player is either the same or has declined.
3. Has he improved the style of play? The answer to this question is a resounding no. Pakistan plays test cricket like they are timeless tests. Watching Pakistan bat in the shorter formats is excruciating. The bowling is generally monotonous.
4. Has Mickey developed and created a system that will outlive his stay as head coach? The answer to this question is a no. Once Mickey leaves we will start again from 0. He leaves no legacy.
Finally, this is not Mickey's fault. Unlike Pep Guardiola in Football, Cricket Coaches have no coaching identity. The vast majority of them do nothing more than monitor net sessions. Mickey is unfortunately no different. On the coaching front cricket needs a revolution.