Essentially the author's key point is that personality is inborn, and therefore parents should understand they are parenting individuals, not lumps of clay that can be molded any which way the parents decide. He also states that parents should not be molded by the latest fads, the latest ideas of how to be a great parent. But I'm not convinced that he does anything more than to say "don't listen to them, listen to me. Cautiously." I didn't agree with all that he asserts or fails to assert. His treatment of the vaccination decision was superficial and felt "tacked on" because, as he said, many parents asked him about the issue. (If you want an in-depth treatment there, check out Jill Aviva Romm.)
Most of what he said feels like common sense to me.