[muraiki]

Sometimes it can be the opposite case. The Udacity course on statistics with Katie Kormanik has lots of well designed problems to work on as she taught various statistical concepts. This helped make sure that I really understood what was being taught and strongly cemented the concepts in my mind. That being said, this particular course is very well designed and it was clear that the instructor had actual experience _teaching_ (she has a M.Ed. from Stanford).

On the other hand, I've taken -- and given up on -- both Udacity and Coursera (more lecture oriented) courses that had absolutely abysmal instruction. I had no doubt in the instructor's skill at the particular domain, but it was clear they had no idea how to teach.