Nietzsche's "superman" theory is digusting. As are a lot of his other ideas come to think of it... killing all disabled people is just... urgh...
The abuse and the distortion of the ubermensch idea are disgusting. Nietzche's postulation of Overman in Zarathustra is much more benign. Man is the bridge between animal and overman. The overman is simply a higher state of conciousness and understanding. The Herbert Spencer like arguments were not explicitly stated by Nietzche. You can blame his popularizers for that- mainly his siter who was a National Socialist and perverted many of his writings. Nietzsche was no Nazi and would have looked unkindly on them. One of the reasons he broke with Wagner was due to Wagners anti-semitism. Nietzche also frequently criticized Prussian/German natiopnalism and militarism. Nietzche was a very complex and often contradictory philosopher. He is frequently taken out of context and misunderstood. On the whole, I disagree with his general ideas but I think he gets an bad rap on many things.