I'm not sure whether the number of people enrolled in a course is a very good measure for the impact of a course. I agree with some other commenters that the nu

I'm not sure whether the number of people enrolled in a course is a very good measure for the impact of a course. I agree with some other commenters that the number of people that completed a course isn't necessarily a good measure either. Some measure that includes the percentage of videos watched, exercises attempted, links followed, etc. would probably better represent the actual impact of a course. Some considerations: all courses have lots of people that enroll to subsequently discover the course is hard, boring or otherwise not what they expected. I expect this number varies strongly per course. On the other hand, not attempting/passing exercises doesn't mean someone hasn't invested time in watching all lectures.