This film reminded me of many lost occasions in cinema where script themes were extremely compelling but poorly executed (think about In Time). The smart idea behind the movie (which comes from the graphic novel La Transperceniege) representing capitalism as a self fuelling train riding across a desert world where no alternative could survive is mostly shadowed by bold action sequences and cliches. This trend reaches the climax in the last 30/40 minutes, as the ending shows us the trite scene of the "final encounter with the villain" along with very predictable events. The characters are hollow, rigid and stereotypical as their dialogues are. Differently from his masterpiece Parasite, neither personal nor societal introspection is here elaborated. Unfortunately, Mr Joon-Ho had a visionary novel that he decided to transpose in an average Hollywood style action movie.
Review of Snowpiercer
