The only Manchester United fans has on Ruben Amorim is to hope cor the better and also expect the worst because they can't ignore the chances of him failing.
It seems to me majority have forgotten the praise Erik Ten Hag recieved when he moved to Manchester United, after all he was doing wonderfully well with the Ajax team, many was saying he was their own personal Guardiola, but in the end things fell off so much now he has been sacked. I think Ruben Amorim will be more humble and cautious than the prideful Ten Hag, who's now a shame to himself after all his bragging statements.
Erik ten Heg has no shame, I believe that for him to get another job it will take time. This new manager will definitely get that praises because is normal for Manchester United fans and one of their problem is over hyping anything that shows any sign of positivity, they won't observe how it will be like in a long run, you'd see them talking as if they have seen the future and the fans can even say the new manager will win them champions league and EPL title, is really funny. Man UTD can't start doing better immediately the new manager comes in but one thing is for sure that whoever has a good record outside EPL when you start playing or coaching Manchester United you'd fail because the expectation will make you start making mistakes.