Yes. Reviews can tell all the other things about a legitimate pharmacy. For example, a reviewer can state whether or not the underlying pharmacy is approved.
No. If a review tells you that the underlying pharmacy is approved by CIPA, for example, you have to confirm that on CIPA's website. I think reviews are just guidelines.
You can rely on genuine reviews from independent review websites. However, crosschecking in the neighborhood can be helpful on which online pharmacy to use.
Certification is always important and asking your neighbors where they get their meds. Reviews are helpful, if you are sure it's a safe online pharmacy.