Overall a good course, that is worthwhile spending the time on, if you want to get familiar with spark and the map-reduce programming model.
The lecture videos and quizzes are pretty lightweight, and nothing spectacular. However, I found the assignments really well structured, interesting, and informative. They use IPython notebook which I found to be a really awesome format for this kind of course and assignments.
The course is not heave on mathematics and statistics, but the assignments will challenge you to really understand the stated problems, and the map-reduce programming model, to successfully complete them.