Well right now there is no disagreeing the fact that Martinez has been absolutely brilliant for Manchester United, i think he has to be their best signing of this past summer transfer window, he has completely cemented his place in the heart of United's defence and also in the hearts of their fans as he is fast becoming a fan favorite.
Good point and another thing that ever since he arrived at United their confidence in defence line has boosted up which was necessary when the team was making so many mistakes in defence. He has not become a strong central defender but also who is around boosting team's morale. I think he has all the qualities of becoming a captain of that team but there are lot of big names around before him so he has to stick at United for a good amount of time unless he is lucky as Odeegard is at Arsenal.
Having said that, he isn't the only one on the top of his game, Dalot, Eriksen, Rashford, Casemiro and a few other players are absolutely firing for Manchester United, it is safe to say that Erik Ten Hag has improved the squad, they just need to continue in this same way and see how high in the table they'll finish, i think they'll get into the top four, then they could prolly win one of the domestic cups, either the FA cup or Carabao cup, if it happens that way, then we might call Erik's first season a success.
One of the key players that brought in a change is Eriksen. Despite what he has gone through, he still is performing his "A" game for a team such as United. He is more like an attacking midfielder but he has adjusted so well as defensive midfielder at United. Dalot has improved, Rashford still far from his best form and Casemiro (no words)- he is still good as he was at Madrid. Erik ten Haag is doing a great job and there comes a time when everyone hits a rough patch so I expect United board to give him still a good amount of time because right now he is building the squad which I feel is much more important than winning cups or title right now.