It is unlikely that anyone doubts the qualifications of Ronaldo. Even if he has some temporary decline in functional readiness, he will overcome it. The results we are seeing are the result of the ongoing crisis at United. Do you think that Mbappe or Haaland would have fared better at United now? It seems to me that no.
There is no doubt about Ronaldo and his quality because he is one of the legendary player of this era and have enough skills for showing his talent even right now things are not favoring him, but he still can do much better in coming days as after win in Europa Game with his goal surely going to be positive development for both Manchester United and Ronaldo because this is good change for them.
Every player have good and bad days so thee will be gone soon, and we will have good end of this player with now as Manchester United is fighting back hopefully we will have them in Champions League in next season and then surely Ronaldo could be man in limelight before end of his amazing career because now it's good time for giving up, and surely he is going to end his career with some good memories at Manchester United.