Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
The story seems completely disjointed. The action is extremely slow paced. But the worst is the dubbing - it is atrocious. Most of the dubbed voices sound as if the actors could not even be bothered to invest emotionally into the story they were voice-acting. The dialogs sound like they are being simply read by utterly uninterested people. I suspect if you stopped someone on the street and asked them to read a line of text to you, you'd probably get more emotional tone than on this show.