The bad urban legend and the similarity to Caveman Science Fiction are both bad signs regarding the movie's overall quality, although moviemakers are perfectly capable of making a cliched movie with quality cinematography and acting. On the other hand, the subject matter is interesting, and I enjoy movies/books with awesomely powered up characters for much the same reason I and others enjoy movies with big explosions. In a nutshell: it's probably a guilty pleasure, but I'd watch it.