Although this is eminently watchable, it's all over the place. Go online and you'll find all sorts of ideas trying to explain the plot from it all being a Fight Club-like nightmare occurring solely in Jason Statham's head to a tribute to the kabbalah (after all Ritchie was married to Ms. Kabbalah Madonna back then) as characters names echo various Biblical figures.
Who knows what the story is and ultimately it really doesn't matter. The action is solid, the acting and casting is first-rate and the cinematography works. The problem is even if it's "art," it still has to make some sense even if the narrative is not linear. Otherwise it comes across as pretentious filmmaking.
I just felt it was in major need of a solid edit and tightening up of the script. There is a "great" movie in here but it's not the one that got released.
The extras have a great interview with Guy Ritchie and one of the producers with some fawning Brit journalist that is worth buying the DVD for. Be forewarned, though, this is not shot in the Lock Stock or Snatch vein at all despite some similar filmic techniques.