The downside of OCW is that, as good as it is, I often find it frustrating because of what's missing from the content for a course. For instance, I don't find

The downside of OCW is that, as good as it is, I often find it frustrating because of what's missing from the content for a course. For instance, I don't find ppt slides very useful by themselves, without the additional context that would be provided by the lecturer. If you attended the lecture, the points in the slides could help you remember the details. But if you never heard the details, it's often not clear what you're supposed to make of the points in the slides. For instance, a slide listing sort algorithms for large datasets might mention bubble sort. If you know about bubble sort already, you might assume (probably correctly) that it's there as a joke or as the "definitely wrong choice". If you don't know anything about bubble sort, you might assume it's given as a perfectly valid algorithm like the others listed. Since it's free, my grumbling is limited. But it does frustrate me at times.