Update: on further reading of the Wikipedia entry (yes after writing this comment) I see that the rating that is relevant here is based on the critical response

Update: on further reading of the Wikipedia entry (yes after writing this comment) I see that the rating that is relevant here is based on the critical response, not the public response. Which probably makes my comment below particularly off-topic. But critics are also consumers, although not usually paying customers. I have a suspicion that consumer rating of artistic content is often a function of how well the marketing matches the content to the consumer who will most appreciate it. Little or no marketing for a niche product might actually produce a higher rating from a small enthusiastic viewership than for a highly marketed product that pulls in more consumers. Of course even those that rated the content lower probably spent money on it.