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He is a good coach but i think he still needs time to get use to the league. People are expecting big results from him because he is in a big club and they are right. He needs to keep his head cool and make some results and start winning titles for Man Utd soon
There are always many trials and obstacles that a coach who trains a team as big as Manchester United will face. The simple reason is that Manchester United has a good history in the Premier League and Europe, of course whoever coaches them now must return that. It doesn't make sense to get Manchester United into top form that quickly, many coaches have failed to do that for them including Mourinho.
Ten Hag needs to be trusted for 2-3 seasons, but if in the end he fails then I think he should go with his failure. However, one thing that makes it difficult for Premier League teams to win the title is Pep Guardiola's dominance at Manchester City, which in turn has made 19 Premier League team coaches currently think hard about him.