How bad is it? It's probably director Gordon's most entertaining film.
Should you see it? Yes, if only to see the cast as teenagers.
Bert I. Gordon shows up a lot on this blog; this film is supposedly based on the book "Food of the Gods," which he used as a title for a later film already reviewed here. Tommy Kirk, Johnny Crawford, Beau Bridges and Ron Howard, all who became famous as children on TV, have major roles. There's music by the Beau Brummels, mudwrestling, an ad for "War of the Colossal Beast" (to be reviewed soon), go-go dancing, giant dancing ducks and boys climbing on the breasts of giant women. Howard plays a boy genius (named "Genius") who creates a goo (called "goo") that causes growth; teens ingest it and decide to rebel against adult authority... in the mildest ways imaginable.