Nothing is perfect. Incorrect or bad reviews are generally obvious & ignored. It's easy to see when someone is grinding an axe or is off base. If I'm really looking at reviews, I always look at several star levels because tastes vary. I hate stream-of-consciousness, bad editing, & flowery language, but like first person narration. Others feel differently, so the star rating doesn't really matter. I don't care for just a thumbs up or down for a book review. Hard enough figuring out a 5 star rating - I keep wanting 1/2 stars. I'd never use YouTube for book reviews. I want to look up a book, skim reviews on the same page. Videos are a waste of time.