Well I would say great if his first season in the Premier League was able to score 20 more goals. I won't argue if you call him great just because he beat Manchester City, but he contributed well to his team by contributing one goal.
I expect competition between Haaland, Nunez and also Ronaldo if he wants to stay at Manchester United. These three players will be compared until the end of the season, but we don't know what they are capable of achieving. Hoping for the best, that's for sure.
Scored 20 goals on first season with Manchester United and he was 37 years old is most great achievement exactly with Primer League as most competitive league, although Ronaldo failed give one ticket on Champion League for Manchester United. But football is unity and team working, what achievement and contributing from Ronaldo less expected with bad performance by other player and make United losing chance participant on Champion League next season.
I think can't comparing between Ronaldo and Haaland or Nunez because first season coming to Primer League and they need how to adapt with Primer League competition, not easy for them ever scoring goals like on other like because have drastically different atmosphere and competitive between Bundesliga or Portugal league.