With the power of Nietzsche, a barbarian-turned-warrior seeks revenge on those who killed his people.
I love it, but I'm biased because of this movie's significant influence on my early self.
Being "from back in the day", this movie is unashamedly-specific about its audience.
More recent sword-and-sorcery movies are watered-down to broaden their audience. Think The Lord of the Rings, which is a phenomenal movie in its own right, but its stark contrast has pushed movies like this one into a "classic" sub-genre. To fans of the recent movies, this one will seem crude.
For fans of the classic style, I'm confident in strongly recommending this. I think it stands out as good, and won't need to be considered "good, but only because of its historical significance".
See also Conan the Adventurer - (1999 television show), only.. don't.