Interesting assessment of what I've always considered to be a successful learning supplement. Not an alternative, and certainly not a revolution, but something people of all ages and backgrounds can refer to when needed. It's a wonderful resource, and this article attempts to diagnose some sort of nonexistent problem with it. It even seems to back off at the end, as if the author realizes he's done little to identify a problem and less to propose an alternative (or even market his product).

Now, if he was going to complain about the "intuitive" approach of KA, he might've had something. Alternatives to KA like PatrickJMT have been successful (to an extent) because some feel that Khan is perhaps a bit too gentle with his teaching method. Baptism by fire certainly appeals to some.

I hate to say it, because comments like these always feel a bit hollow to me, but "Sour grapes" is all that comes to mind with this article.