Carrick proved to be a very good manager, and we saw that when he was given the opportunity. Manchester United reached a completely different level under him. They beat every team and climbed to third place in the league after Amorim left. I think the management's most successful decision was the manager. We all witnessed how a manager can elevate a team to a higher level.
Maybe it is still too early to say he is a very good manager for Manchester United. I will like to see him handle the team for a whole season when they get into the Champions League, and have that to play alongside the other competitions in England. I feel a reason he has been successful in Manchester United is because his job has been straightforward which is to help the team finish top four, and it has been easier to do as Manchester United have their players well rested as they are only in the Premier League.
We don't know whether Michael Carrick is a good manager or not, because we won't know what will happen to Manchester United at the end of the season, as their performance could decline towards the end of the season. In my opinion, Manchester United's ability to reach this point still owes a little to Amorim, as Michael is new to Manchester United as a manager. However, Michael Carrick is certainly great, and I don't think Manchester United made the wrong choice, as Manchester United is now in fourth place.
Now, we'll just have to wait and see if Manchester United can perform well again in the upcoming matches. However, I think if Michael Carrick can make Manchester United perform even better, I think Michael Carrick deserves a contract extension at Manchester United. I hope Manchester United can play in the Champions League next season, as I haven't seen Manchester United play in the Champions League in a long time.