>The consensus stresses that melatonin is a very weak hypnotic. The Buscemi meta-analysis cites this as their reason for declaring negative results despite a statistically significant effect – the supplement only made people get to sleep about ten minutes faster. “Ten minutes” sounds pretty pathetic, but we need to think of this in context. Even the strongest sleep medications, like Ambien, only show up in studies as getting you to sleep ten or twenty minutes faster; this New York Times article says that “viewed as a group, [newer sleeping pills like Ambien, Lunesta, and Sonata] reduced the average time to go to sleep 12.8 minutes compared with fake pills, and increased total sleep time 11.4 minutes.” I don’t know of any statistically-principled comparison between melatonin and Ambien, but the difference is hardly (pun not intended) day and night.
>Rather than say “melatonin is crap”, I would argue that all sleeping pills have measurable effects that vastly underperform their subjective effects. The linked article speculates on one reason this might be: people have low awareness around the time they get to sleep, and a lot of people’s perception of whether they’re insomniac or not is more anxiety (or sometimes literally dream) than reality. This is possible, but I also think of this in terms of antidepressant studies, which find similarly weak objective effects despite patients (and doctors) who swear by them and say they changed their lives. If I had to guess, I would say that the studies include an awkward combination of sick and less-sick people and confuse responders and non-responders. Maybe this is special pleading. I don’t know. But if you think any sleeping pill works well, melatonin doesn’t necessarily work much worse than that.
The evidence says that it's a very weak hypnotic. The writer then makes a long, pseudoscientific argument against the evidence, while making a claim that their article is scientific, even though it wasn't peer reviewed. They make a cherry-picked comparison to Ambien, Lunesta and Sonata based on an article by non-scientific newspaper New York Times to bolster their claims; they ignore the ability of other, more potent hypnotics to improve time to sleep and sleep length in mental illness-caused insomnia -- on whom melatonin may be ineffective -- and in people with different causes for their sleep disorders.
I leave it as an exercise to the reader to find the other flaws in the article.