The expectations were high and they needed him to come in and change everything immediately. He sounds so confidence that he can make a change immediately but unfortunately things are not going as he wanted too and have to just love by the reality that the premier league is not the same as the Portuguese league.
I mean he can't do anything if the players played terribly and can't follow his tactics. The club needs to sell a lot of players just like how they support Ten Hag in the beginning. Asking him to change everything is quite an impossible demand if he can't use different players. It's not like he can swap their players with academy players and call it a day. The next transfer window and how the board react should paint a picture whether United transition season is good or not.
Don't be too hasty, he just joined and has only played a few games, some of the results are satisfactory, some are not. He needs more time, because he came in a very bad situation.
A coach is not a magician who can change the situation of a club in the blink of an eye, everything takes a process and that's what he's doing now.
He didn't come when the team's foundation was very good, so he had to build that foundation from scratch again. But in terms of the game there are changes that he can bring, yes, even though the results are not satisfactory. However, that is a hope as long as he is still trusted.