The only useful reviews are the ones you trust from people who share similar thoughts about what you enjoy. You could aggregate the rating of everyone on the planet and it still won't be a useful metric. Reviews from only people self-selecting that would have watched the show in the first place are also not useful.

Reviews from critics who are bribed to give 100% are less than useful. It is worse than useless. It is actively harmful. "Bribed" in the sense that they are given early access to something and don't want to lose access as their livelihoods might depend on it. Sometimes they might be bribed with actual money, who knows.