How bad is it? It's the meeting point of bad science fiction and bad cavewomen movies.
Should you see it? Yes.
This film, just like "Voyage to the Prehistoric Planet," uses footage from "Planeta Burg" and was produced by Roger Corman. This was directed by Peter Bogdanovich snd has Mamie Van Doren in the cast. Stranded astronauts land on a planet of women in clam shell bikinis who have psychic powers and worship a pterodactyl puppet. It's about as bad (and as good) as that sounds. Amazingly, the astronauts never meet the women! Apparently, their scenes were shot at very different times and spliced together.