I think many people misunderstand this work...or this collection of notes made out to seem like a work. The Will to Power was considered for a long time to be Nietzsche's masterpiece. Now we understand that Nietzsche did not even publish this work; it was the product of his anti-semite sister, Elizabeth. The Will to Power was a book he planned to write. That was, of course, before he started his plan for the four book "Reevaluation of All Values"--a plan only partially completed with the publication of _The Antichrist_.
I would only recomment this book to people who have read Nietzsche for a number of years, and only then with a large disclaimer that this book isn't meant to be taken AS a book. Walter Kaufmann, in the introduction, states that this book should be seen only as a collection of notes. Furthermore, I would also like to point out that the notion of die Ubermensch ("the overman", or in less exact translations "the superman" is not necessarily supposed to be taken within a genetic context. Overcoming onesself constantly, learning to think for onesself and read for onesself is something that Nietzsche seems to prize. Of course, these ideals don't really fit within what we know of Nazi ideology. Nietzsche did value hardness, he did critique Judaism and the mediocre. However, he also critiques anti-semitism, Christianity, modern science, women, men, men's depiction of women, etc, etc, etc. He often contradicts himself, so as to make the reader grapple with the subjects he discusses. One must always be careful about saying that one "understands" Nietzsche--the more one studies Nietzsche, the more one comes to realize how little one really understands Nietzsche.