This movie had a very unusual plot. It was basically unexplained, and at the end I was left wondering what I had just seen. It's not that the movie is hard to follow, rather that it doesn't give you much to follow. The main characters are never really defined outside of the specific events that occur in the movie, and vague references to events immediately before the beginning. Perhaps this was done on purpose, to avoid tying down the identities of those who were involved, in an effort to create the sympathetic characters most films aspire to. But it left me feeling like I'd missed something.
The film included shady denizens of the Paris Metro, but I'm not sure it focused on them as much as I expected. I expected the film to be about a normal main character running across an unbelievable array of weirdos in the subway, but the weirdos simply weren't that weird. I think I've actually see weirder people in the Paris Metro in real life. Instead, the weirdness in the movie comes from its lack of definition. An unidentified main character having stolen mysterious "papers" from the unknown rich husband of some random woman he happened to meet on the street.
I'm not sure what the movie was trying to get at, but I think it was leaning toward inspiring spontaneousness in all things and the consequences that brings. It really didn't ring any bells of resemblance for me with any of Besson's newer movies (Léon, Fifth Element), even though it had a score by Eric Serra and Jean Reno made an appearance. It also had the Eighties stamped into and slobbered all over it.
I can only recommend this movie to Besson fans trying to get a bigger picture of his work, 80's freaks, or anyone interested in trying to decipher cryptic movies.