IMDB could separate mens scores from women's; as well as show what shows were highly or poorly rated by the same people who rated a particular show. That would give you a better idea of the value of a rating in deciding if you might be interested in the show.
I suppose that would be useful, but you really can't solve for the general case. For example, my favorite film is Fellini's 8 1/2. It has a very high rating, but I suspect that people who would generally like that kind of film go out of their way to find it and watch it, and rate it. If Netflix pushed it on their front page, I'm sure IMDB would fill up with negative reviews from people who hate B&W films, surreal plots, over dubbing, long films, and generally not be ready for the experience. And then you have every terrible blockbuster start out with an 8 rating, mostly from teens, before the rating slowly falls as others discover the film. Another example is a film like ET, which I despise. It has a high rating, and I understand why. I have no problem with that. But it is still a terrible film. You have to take the audience and distribution into consideration. It also helps to read the top of the "Loved it" and bottom of the "Hated it" to see WHY people rated it the way they did.