The problem is that even reviews from verified purchasers get gamed in the real world, and aggregated reviews can only cover simple information because people don't have the expertise for a proper review (e.g. try to find basic information like idle power consumption for computers. Or whether some part has working or broken pcie power management). So the problem is that you need morally unassailable competent reviewers.
In theory, you'd need consumers to fund such an organization only until they had so much sway that a review from them became essentially mandatory for anyone to consider your product, at which time they could charge a fee to review a product without becoming beholden to the companies paying the fees.
In theory, you'd need consumers to fund such an organization only until they had so much sway that a review from them became essentially mandatory for anyone to consider your product, at which time they could charge a fee to review a product without becoming beholden to the companies paying the fees.