I agree with many of your points but the main reason I use Coursera is because it's an actual course, with structure and quizzes and assignments. I personally f

I agree with many of your points but the main reason I use Coursera is because it's an actual course, with structure and quizzes and assignments. I personally find Khan Academy to be useless, and I've tried to use it (Edit: useless for me, but I do think what he has created is fantastic). I think I would find it useful as a supplement to an existing course, and that's what it was originally designed as. Very few people learn anything of moderate complexity without doing exercises throughout.