Is this worse than Never Say Never Again?
It's very close. Both are among the worst 100 movies ever made.
This one is a conglomerated mess. The writer can't communicate one coherent thought. There's not one coherent thing about this movie.
So it's difficult to say what it's about, but it's dull, uninspiring, and uninspired.
The hero played by Connery has no motivation for a single thing he does. He likes plain women more than pretty ones. When he speaks, there's no motivation in any of his lines. Sure, they're poorly written, but good actors give meaning to any line. Connery fails. Perhaps he meant to fail, because this was a horribly written screenplay.

* Connery plays a savage who enters some sort of civilized land of people who behave like ancient Romans. That's about it. Some stupid character comes in and acts like he's a god, and the writer treats him like a god, for no reason, and he makes no sense. He drivels on and resembles Guy Fawkes, so that must be what the writer wants to convey. Who knows? It's poorly communicated.
The ending is a blood bath that also makes no sense, with savages killing the pretty women instead of raping them. The writer and director both bungled this up big time as far as any credibility goes.
I dare say this one is even worse than "Never Say Never Again", because you can fall asleep through that one, while you get irritating noises and irritating sounding people trying to keep you awake in this one.