I think the criticism has been more nuanced than the actual defense. People defending Haaland basically bring up he is the top goal scorer and that we won the treble last season. That lacks all type of nuance. I've seen criticism about his heading technique, about how different outcomes could have made us treble winners in other seasons, about the two-forward system, about Haaland having worst xG vs goal by a significant margin than last season, about his repetitive movement when there are crosses...
There is bad criticism of course, but I think most of it has been fair. Whoever says we won the treble because of Haaland, that his finishing and form is at the level of last season, that he is our best player or that he is above criticism just because he is top goal scorer is deluding themselves.