I must start by saying that you should not watch this film with the same expectations of a large Hollywood production because it simply isn't.
With that in mind however, I found it very easy to appreciate how this film follows the graphic novel/detective film translation. Moreover, it borrows a lot from Sin City in its colour scheme, lighting and general feel. The fight choreography is gritty and satisfactory. They integrate the standard line of thugs in with trained "guards" and a certified martial artist in Lateef Crowder (Max).
The biggest surprise is how much depth they add to the surrounding characters beyond the protagonist. Simon and Sandy bring forth a lot of different emotional reactions and really help raise the entire acting level of the film. There are few lines in this movie that should crack a smile as well.
Overall it's a slightly different take on your standard detective narrative and worth a viewing if you have time to kill or enjoy the genre.