And I also have the impression that Netflix shows have a stronger "fan review only" effect, as you must be proactive to start watching that show on the first place.
Another effect is that for movies, after you decide to watch it is easier to get to the end even if you are not liking (more so if you are on a theater). So most people watched 100% of the content. If you don't like a show, you do not pass the first episode. So if you did not watched more than 10% of content, I assume you won't feel confortable with giving a negative review.
So that is why I dont trust reviews for TV shows