How would you disagree with it? In regards to its view on math or on math education? I have thought a bit about this and I see quite a few problems with his approach to the latter: a) the number of students b) the frequent lack of motivation of the pupils (which probably will never completely go away) c) the lacking education/motivation of the teachers

So I dont really think that for large-scale education his ideas can be implemented, but that they are great for teaching your kids/friends about something.

But I do not see how you could not agree with him that the current situation is disastrous, since everything he said hit home for me when I was a student. So I would really appreciate if you could point out where he is wrong, since a big part of my views about education/math are based on this.