Basically, I want it to be like the book recommendations section of Amazon, but for movies. By ranking your movie tastes (how much blood and gore you can handle, how much slapstick comedy you can tolerate, how much happy endings, good animation, or intelligent plots matter to you), or assigning scores to movies you've seen based on how much you like or dislike them, the engine would then recommend rental titles or current in-theatre picks.
I don't have a TV, so I'm out of the loop on previews, and I've lately discovered that previews don't help me much anyway. In some cases, they make a mediocre movie look great (Big Fish), and in a few cases, they make a great movie look totally unappealing (like Lilo and Stich, or The Emperor's New Groove). I don't need to know if the movie got 4 stars, Best Screenplay, or two thumbs up. I need to know if I would like it. It doesn't do me any good to hear that Children of Men is a great movie (which it is, by all accounts) if it's so violent that I walk out scarred and weeping. And let's face it, some of my favorite movies were not critical successes, and rightly so (::cough, cough, Surf Ninjas cough::).
We all have different tastes. I've disliked some very good movies, and almost missed some great ones because I had misconceived notions about them. I also have a very hard time choosing movies at the video store.
So, how do we create this?