They aren't missing the point. You are. There's only so much information you can pack into a 'star rating'
Movie Critics are rating movies by how good they are on a multitude of levels. A 4 star movie has to be entertaining, interesting, thought provoking, well written, well directed, well acted, etc, etc, etc.
Well said. I find myself having this problem when doing something as simple as rating my Netflix movies. There are some movies that are extremely well executed, and an excellent example of the genre, but it doesn't necessarily appeal to me from the entertainment value standpoint. So, how do I rate it? Based on personal taste, or based on the quality of the movie?
I tend to rate based on quality of the movie. This often leads to "interesting" Netflix recommendations, but I like to keep track of those ratings so I can recommend them to other folks who are more interested in those movie genres.