There is not really a way to tell for sure. I would personally just go with the majority. The testimonies are coming from regular people and everyone may have a different reaction to the product.
Proactive reviews are more thought of answers than the reactive reviews. Generally the reactive reviews are given by people without muh thought but the initial instant reaction. These reviews are...
Diet reviews give you the major pros and cons of each type of diet. They are accurate for their facts and content only; results differ from person to person.
You can find reviews for proactive products on their main site. There are also reviews on blogs and on online discussion forums that deal with skin care and acne.