A strong defense of self help books can be found here: On Self-Help Books | The Book of Life.
Essentially the argument is that the genre has been overtaken and is associated with people like this:
And not associated with this:
We need a list of good self help books, classic and current. Unfortunately, even lists with the so called best self-help books of all time are lacking in literary qualities. That’s a shame.
I think we need a new list of self-help books then, a list stretching from the classics such as the Dhammapada and the Bible and the Meditations of Marcus Aurelius, all the way to present day books like In Search of Meaning. A new list of books that help us live better lives but that are good as books themselves. It’s time for such a list, and time for the current list of self-help books to take a backseat to this new list.