But what MOOCs give me is the exercises. I often think I understand a problem, but it's only after getting 2.1/10 on a Coursera quiz that I realize I've missed a key step or concept.
Many textbooks have exercises but few have solutions. I've been working through Barto and Sutton's Reinforcement Learning for example (again), and although I do the exercises and programming questions, I never know if I've gotten it right. My experience with MOOCs shows I probably haven't in a large number of cases.
The best of both worlds is when I can follow a MOOC with the textbook to gain more depth, for example with the PGM course on Coursera.