More and more movies are released each decade.
Ratings are pretty well distributed, and most are better than the rating average (a rating of "5").
Ratings are well correlated between databases.
Mean ratings have slowly been changing over time, depending on the audience.
Mean ratings may have been changing because of the greater prevalence of "bad" movies (movies with low ratings).
Most movies on RT have 10-30 critic ratings, but there are a few movies with over 200.
The mean movie duration is about 95 minutes, though this has flucuated across the decades.
Interestingly, the duration of most popular movies have been increasing in recent years.