I think it's too early for us to say if Amorim has a worse performance than other coaches, because as we know if he coaches only half a season and the squad he has is also the legacy of Ten Hag, so we can't say if he completely failed at Manchester United, the transfer market next season in my opinion will be the proof for Amorim in building his squad absolutely, so we can see how the performance that Manchester United shows next season and that's when we can say whether Amorim is the right coach or not for Manchester United later.
But, if we compare Amorim with another coach who successfully managed the team in half a season, Amorim looks like he failed to manage MU based what on he did before. If we talk about players who can't compact on his strategy, Amorim should quickly adaption to the current squad. he was expected by many people to lift MU position from the bottom rank, but he can't do that so far so make many people are disappointed in his performance, and perhaps recruit a new coach to replace him. If he can't recruit a new player to fill up the gap position, I think he will not be long, and will be replaced soon by a coach who is targeted such as Xavi Hernandez.