To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
I'm a guy who wants a no BS shampoo that deep cleans my hair, smells good, and doesn't leave residue. I also don't use conditioner so it can't dry my hair out. This shampoo delivers on all counts. At $45, it's not cheap, but it's worth it.