Sometimes entire comment sections can be wrong/bad. One way is for early comments to be wrong and for the corrections to fail to overcome the feedback cycle of bad takes pushing each other up. Another is for threads to devolve into repetitive flame wars which can create a lot of comments and mislead someone who might think that opinions repeated in many comments are commonly held (rather than strongly felt and easily regurgitated by a few).

For this reason, I don’t think a wisdom-of-the-crowds approach is valid.