He has. I've got several of his books and they are good, but rather over-written.
The first half was intended to illustrate the real horror of what it means to be a non-muslim in a Wahabbist state. In that sense, I think it was effective. It clearly touched some raw nerves as he's now getting it in the neck (as it were) from any number of Islamist apologists saying that slavery under Islam isn't so bad and trying to claim the Prophet Mohammed didn't knob a nine-year-old (he clearly did).