Is this bc the information is not useful or bc people aren't interpreting it right ?
I am not sure. There are a couple of free / very cheap interpretation websites that you can upload your 23andme raw data to, and these sites will provide an interpretation, pointing out all the SNP mutations you have which may potentially have an impact on your health.
One is
Genetic Genie (free) and the other is
Promethease (their report costs $12).
So there's no great difficulty in getting the data interpreted.
In my case, for example, I found I have double mutations (+/+) for a few SNPs such as
MTHFR C677T (which means I process folic acid poorly, and may benefit from active folate supplements),
MTRR A66G (which can be helped by taking B12 methylcobalamin) and
SOD2 A16V (which means I have reduced superoxide dismutase antioxidant capacity within my mitochondria).
I do take active folate supplements (they seem to reduce my depression slightly) and get a good dose of methylcobalamin from Greg's B12 transdermal oils (which reduces brain fog quite a bit, I find). But in reality I worked out these things were beneficial for me just by trial and error, rather than basing it on the SNP reports.
When genotype testing services like 23andme.com first became cheap and popular, professional athletes started using them to see if the info could help improve their athletic performance. I remember reading a comment by one professional athlete, who said the genotype info was interesting, but was something that he had intuitively worked out for himself anyway.
In other words, genotype testing implied certain supplements would be helpful for this athlete; but he said he had already worked out these supplement were beneficial just by trial and error testing. He said that genotype testing just confirmed what he had already worked out for himself. Which he said was a useful confirmation, but did not tell him anything new.