I agree that a huge value of a school is learning from your peers, but I personally think homework is one of the most important parts of school also. That's honestly where I learned most of what I did in college.
I agree at least up to a point depending on the course. And, having said that, it's a problem for most MOOCs:
The fact that student are mostly casual and at least shouldn't expect any sort of meaningful certification means that it's hard to expect the sort of time commitment that I put into many of my university courses.
There aren't good mechanisms to evaluate and provide quality feedback for in-depth homework. (And peer review most certainly doesn't count.)
