I was thinking about something here. Feel free to shoot it down if it's too crazy, pix.
The question of repeated movies from the regular ratings project is an interesting one. Many of these will be crossovers, I think, and there's gotta be some reason to go back and revisit those movies we've already rated. So, how about two ratings for each movie, one for the quality of the film and one for the scariness. That way we could have some crowd-sourced list of scary movies that aren't really scary for those of us that don't particularly like the things that go bump in the night and a way of finding out what is the scariest thing we've seen as a community. This would involve probably a spreadsheet which has two columns, one for quality and one for scary factor. Too much work? Not enough payoff? Pick it apart!
Maybe a straight 5 category system.
5 - Terrifying
4 - Really scary
3 - scary
2 - moments of scariness
1 - not at all scary