Ronaldo is still a very good striker, I think that leaving Real Madrid was a mistake for him, he deserves a better club with a champion mindset. In Juventus and Manchester United he definitely shows his high level, but in these clubs the difference in the level of players and Ronaldo is clearly noticeable. Ronaldo can score a lot of goals, but it's not enough to get great results with these teams.
He has outstanding finishing skills that are hardly to find in other players. He has most strongest mental among football players and he is superb professional with his training and care a lot of his body fitness. Sometimes, he has some unprofessional reactions that look bad but it can not change his overal quality.
Ronaldo needs good assists from his team mates and he will convert most of key assists to goals.
I think the strike creator from Man United who should probably be killed in that game is Sancho. he's been outstanding, a lot of Man United's attack has developed from the flanks. but in that game, Rashford did not play well.
It seems from that match, Ronaldo has found his good team mate in Manchester United, Jadon Sancho. Sancho on his side, has adapted very slowly and badly to Manchester United. However, in second part of season, with Ragnick, he has returned and shown his dangerous skills. If he can continue his connection with Ronaldo, Manchester United will have more goals from this combination.