I think with the squad that Manchester United has at the moment it won't be too difficult for Ten Hag to manage this team because there are many good quality players here in almost every line, especially Manchester United's midfield has some quality players.
but that doesn't guarantee that it will match the tactics that Ten Hag will apply, I think Ten Hag just needs to add a few more players to be able to make Manchester United's performance better next season.
Indeed Manchester United have a good squad overall, but from some of the coaches who managed this team last season I would say they failed. I don't know what their failure was due to what factors, maybe from the players themselves or from the strategy the coach was given. Every time a new coach manages this team it is always accompanied by the belief that they will be successful, but in reality they are not able to deliver everything that is expected. Now that Ten Hag came with the same expectation, the question was whether he would really be able to give his best or not.