Speaking as one of the interns that worked on the project, I don't really feel that this was too harsh. Had he focused on all the things that were wrong with i

Speaking as one of the interns that worked on the project, I don't really feel that this was too harsh. Had he focused on all the things that were wrong with it and torn it to pieces, I would be inclined to agree, but he's provided a number of very specific ways in which the environment could be improved. Some of these ideas were considered and not implemented for practical reasons, others were left out due to time constraints, and some we honestly just didn't think of. On the particular note of practicality, we were trying to make the best thing we could make exist now. I hope that Khan Academy Computer Science in its current state looks laughable in a few years - both compared to what it becomes and compared to what other people have built.