Can't echo this more. The Scala Functional programming course on Coursera is another such example. I am yet to finish the assignments, 2 months after enrolling.

Can't echo this more. The Scala Functional programming course on Coursera is another such example. I am yet to finish the assignments, 2 months after enrolling. OTOH, the deep learning course from Udacity was a cakewalk in comparison. I wonder if it makes sense to build a good recommender for MOOCs based on a student's appetite for challenge. Something like the adaptive questions on GRE but for MOOCs.