At the top of the chart, the ratings spread out. To me, this shows broad appeal. And, I think we've all learned that the more people who vote, the closer to a bell curve the ratings look, with the middle getting the most votes. Which is why so many popular movies have middling ratings.

The higher ratings near the bottom show niche appeal, few people voting, but a more loyal audience.

I could be wrong. I never took stats in school.