I agree with you about the stereotypes, as I read the review I was asking myself if the author really had researched the early lives of these three men, I would never say that any of them had been pampered as children!
The generalization that the three of them "...were certain that their fondness for one another, and their blood ties, could effect long-term peace in Europe" is ludicrous. She must not have read much about Willie and his relationships with the entire family if she thinks this is true. However, as reviewers do like to quote eye-catching phrases this may not have been in context.
I'll probably check it out at the library but I don't intend to spend $30 for it.