> When I read a critique that could roughly be summarized as "I could have done better"

This feels like a pretty shallow take on a what seemed to me like a pretty in depth and interesting review. Clearly there's a huge amount of potential ground that could have been covered in a film like this, so a critical look at what was and wasn't included, the angles that were chosen, the parts that were glossed over etc. can be revealing. Put another way, I think the review is a pretty in depth look at the questions "what was the artist trying to achieve?" and "Did they succeed?".