Ronaldo has a handful of his fans who are die-hard Manchester United fans but there are also Manchester United fans that believe he's setting the team backward. Even some former teammates are throwing tantrum at him online when the team doesn't perform. I think irrespective of what the research study shows, we know this is not the Ronaldo of 10 years ago he is not as fast and sharp as when he was 27. In contrast to other players, Ronaldo is indeed exceptional and seems to be aging well.
I think Cristiano Ronaldo has been more than helpful to Manchester United this season even when the team mates seems to lack mentality, you can never doubt his passion for the club. I think he should be praised not criticized. Ronaldo deserves better. Those who criticize him are just trolls, either they are envious of his career or they literally know nothing about the sport.