3.8 is precisely the right rating for 'Repo Man'. It's a film to watch when young and preferably a punk. Cool in an insouciant kind of a way. Poor Cox was never going to be able to recreate this vibe as he aged - it's got that swaggering amateurishness of youth tied to a very specific time and a very specific place. Hilariously slow chase sequence. Bratty but winsome.
It may not be a classic in the classic sense, but it has been deemed a classic in the cult variety and therefore earns its spot in the annals of the criterion spine. Relating it to other similar low budget sci-fi cult films, while apt, is also under crediting it to some degree. It's more than just that: it's a social commentary, foreboding warning, and a reflection of a time, place, and culture.
It's like watching an 80's synth wave music video. Beautiful cinematography! There are subtle and gorgeous tinted lighting whether it's day or night scenes. The characters are an epitome of "cool" as well as the music and the collection of classic muscle cars in this film.