There are different types of bad movies.
This falls into the pretentious bad category, which is the most fun. It is the sort of movie created by someone who takes himself far, far too seriously. He has a degree of talent but not nearly as much as he thinks he has so his strivings for Meaning and Significance and Truth are as clichéd as .... a commercial.
Joe Brooks, a jingle writer of the era, was the 'creative genius' behind this effort. Director, writer, star, teeth grindingly sappy ballad writer. Hey, it was the 'auteur' era so why not get in on the action ? Fortunately, the summer special effects blockbuster was discovered at precisely that time so the threat of Joe Brooks, auteur, was nipped in the bud.