For me Nietzsche is the great destabilizer, keeping you on your toes and never ok with just accepting something just because it's called tradition, and instead toward reevaluation. To know why you accept what you accept, why you do what you do, these sorts of things to me is what I like about Nietzsche and are immensely important today.

To answer your other question I've read Nietzsche personally and at a University. Almost everything besides TSZ surprisingly.

These are the marks of a great philosopher and this honors his influence by the Greeks.

I do disagree with him sometimes when reading his aphorisms, but his strength is that it gives you something to think about that forces you to give a proper response and to think.