I noticed a few months back that overnight almost all silent films and many (if not most) films of the 1930s took dumps in their ratings. Many of these films dropped 2 points or more (e.g., going from a 7.5 to 5.5) overnight without a single additional rating vote. For some reason IMDb took it upon itself to manipulate the ratings of older films (not films admired by the comic-book set) to downplay their ratings popularity, especially as compared to newer films that feature super heroes and cartoon characters. IMDb's secret formula for ratings, not a simple arithmetic average, allows for any ratings number to be assigned to any film, based on the prejudices of the IMDb staff. Since your ratings are not based on what users think and vote, why even bother having ratings? Why bother showing graphs of ratings that only prove your manipulation of the final rating? In essence, your ratings system is not indicative of anything but what your staff thinks. You might as well bring in the "tomatometer."