Regarding easiest vs. hardest, while I'd tend to agree with the conclusion, the logic is just plain wrong. Final course scores depend more on grading structure

Regarding easiest vs. hardest, while I'd tend to agree with the conclusion, the logic is just plain wrong. Final course scores depend more on grading structure than anything. Many of the best courses use mastery learning. You can keep trying until you get it. This usually leads to 100% averages, actually quite well-deserved, since all students learn everything. Heroes was a course which encouraged different levels of participation. It's probably the best MOOC ever run, but explicitly designed so you'd get out what you put in, and to accommodate all levels. Many students chose to put less in.