Maybe put in an inflation adjustment factor. That would reflect how a movie rates compared to it's contemporaries. You'd have to be careful not to cap a movie

Maybe put in an inflation adjustment factor. That would reflect how a movie rates compared to it's contemporaries. You'd have to be careful not to cap a movies' rating just because scores in that era are more lenient though -- maybe pull movies toward an overall median based on their distance from a 2-3 year moving average. So say we want the median score to be 50%. And the median rating in 2008 was 63%. Let's take two movies from 2008 -- one scored 98%, the highest score in several years, and one scored 63%. The 98% movie stays at 98%. The 63% movie score becomes 50%.