I'm of two minds about the art. On the one hand, the scratchy, unfinished quality is the perfect match for this gritty detective story. On the other hand, I tend to have a lot of problems keeping characters straight, which is only exacerbated by the way the story jumps through time.
The art aside, however, this is a great story and character piece. Fialkov uses Frank's brain tumor as more than just a gimmick, but rather as a tool to peel away the layers of his guilt and cynicism, finally exposing a guy who just wants to do the right thing.