Most of Nietzsche's best work is from random ass notes found across his office after his death. He's hard to read because he didn't write to be read in the first place. He just had ideas and was too ADHD to organize them before he got ill.
He was brilliant. His understanding of Nihilism and takedown of "cogito, ergo sum" are hard to dispute. "The will to power" is a fascinating concept for the modern age, running through so much of the human behavior that we rationalize and justify. As much as I dislike how his choice of words empowered fascist ideology, he did recognize that Europe was ripe for the taking by a strong leader.
His philosophy ties in well with Marxism and Darwinism, as well as most other philosophers of the scientific age. It's not perfect or easy to understand, but his writing is filled with phrases of shocking wisdom. "God being dead" is the least shocking thing he realized.