I think there is great utility in the concept. The most accessible description of a movie is the trailer, and this site allows people to comment on how accurate

I think there is great utility in the concept. The most accessible description of a movie is the trailer, and this site allows people to comment on how accurate this description is. The use-case I see is people looking for movies they're interested in and watching the trailer. They can then use their impression of the trailer and the comparison of trailer to movie to get a better feel for what the movie is going to be like. Rather than a simple rating scale (80% of people liked this movie), there is a more subtle dimension to the metric of this site: Of the people that liked the trailer, this fraction didn't like the movie; or of the people that didn't like the trailer, this percent of people actually thought the movie was good.