I'm rather ambivalent towards Nietzsche; he had some interesting ideas, but he also had an utter contempt for anything resembling system or formality. Ultimately, I think that Max Stirner fills that specific niche a lot better, and would recommend his work over Nietzsche's for anyone interested in Ur-dissenting, skeptical-towards-everything, everything-about-modern-civilization-is-wrong philosophy.
I'm partial to Stirner as well, and think he does a better job of the fundamentals of conceptual hygiene than Nietzsche.
But with Stirner, you're liberated from some conceptual errors, you're free to value without conceptual handicaps, but left with a "now what?" on how to do it. Nietzsche at least takes a stab at new values, though I maintain he creates some of his values for those he feels are inferior and allow values to be imposed on them in their conceptual confusion. A Will to Power, even in philosophy.
One other thing I'll say for Nietzsche...
So, at the risk of starting controversy, I'm not exactly sure what the policy is about asking questions on philosophy..
But would you mind giving your opinion on Nietzsche? I just bought Human, All Too Human. It's a tough read for me, and I'm sort of plowing through it, though it's interesting and stuff.
So... what do you all think? :D
Edit: I changed it from "Rationalist opinion of Nietzsche". Better?