A short critique of the Khan Academy

Tony Bates:

Bean, E. (2012) Wrath of Khan?: Deconstructing the online learning academy Detroit Web 2.0 Examiner, March 12
Eric Bean is an educator who has signed up as a coach/volunteer for the Khan Academy. The Khan Academy has a library of over 3,000 videos covering everything from arithmetic to physics, finance, and history and 315 practice exercises, all free. The focus is mainly on k-12, supporting home schooling or providing additional support for students outside (and sometimes inside) school.
Bean has a number of criticisms from the point of view of a ‘coach’. (Interesting use of language here by the Khan Academy: why not teacher or tutor or instructor? Is there a difference in Salman Khan’s mind, and if so, what is it?) Bean’s main criticism is that the interface and navigation for coaches is poor, especially compared to the student interface.
I have another criticism. As someone who struggles with math, the Khan Academy would seem perfect for me. My problem though is I don’t know where to begin. Just jumping at random into a video suddenly makes me aware that I need lots of prior knowledge before I can understand this video, but there’s no help on that. Also, where’s the feedback? If I still don’t understand after watching the video several times and doing the exercises, what do I do?