Ronaldo is a good player, it's just that the mismatch with strategy and also the many players who rely on individual skills at least makes Ronaldo's performance decrease slightly due to lack of support. Yes, I have said before that Manchester United's gameplay in the first half was very boring, it can be said that Rangnick tried to find a way by letting his team play badly at the beginning. Implementing a strategy like this will be very dangerous against a better team, I really don't think Rangnick can take advantage of the good players that Manchester United has.
Manchester United gave Brigitte a chance to attack a lot in the first half. If they use such tactics against Liverpool or Manchester City, they will concede at least 3 goals in the first half. Manchester United's defense is not good. Only because of the efficient goalkeeper they have conceded fewer goals yet.
Manchester United attacked a lot in the second half. And trying to score from the counterattack. This strategy was good. If they had played this technique in the first half, they would have been able to control the whole match.