I went looking for a good Nietzsche criticism and I found this piece by Santayana. This particular paragraph jumped out at me:
The first principle of his ethics was that the good is power. But this word power seems to have had a great range of meanings in his mind. Sometimes it suggests animal strength and size, as in the big blonde beast; sometimes vitality, sometimes fortitude, sometimes contempt for the will of others, sometimes (and this is perhaps the meaning he chiefly intended) dominion over natural forces and over the people, that is to say, wealth and military power.
This seems to me to be the classical misunderstanding of his philosophy. Santayana conflates Nietzsche's obsession with power with his value of it. Power is not always "the good." Hitler was powerful but he certainly wasn't good. Nietzsche didn't believe the power was good - but he did believe that without power, the good was impossible. People without power cannot be good. They are too easily manipulated, and they lack the understanding to appreciate the good when they run into it. The "good" form of power manifests itself in philosophy, science, knowledge, independence, and self-control (honesty falls under self-control).