The film critic who calls himself "The Hulk" argues that the hero's journey has become a screenwriting crutch.
According to Hulk, Joseph Campbell originally formulated the paradigm to help analyze existing myths and to draw connections between them. Campbell's template was made famous by George Lucas, who used it as the deep structure for the original Star Wars movie. Since then it has become a production template used by screenwriters to create a glut of similar films and video games.
Hulk says it's not the only story plan that works for adventure movies, and it has become a tiresome cliché: "Our society has overtly adopted the book's breakdown of the hero journey as some kind of ready-made app for paint-by-numbers storytelling."
Hulk blog post on the Hero's Journey myth
The Hero with a Thousand Faces (the book that started it all)