I went to see it somewhat reluctantly because Norton's character seemed a bit silly, but I was pleasantly surprised. It's nothing very original for this type of story, but it works well and several key scenes are very well delivered (Baldwin for best supporting actor ?). Also we don't get to see that many films these days with that type of classic Noir story (the closest I can think of is season 2 of True Detective - which is set today - or Inherent Vice - which is a kind of absurdist parody of Noir ? ). I feared having a hero with Tourette in a pretty long movie would make him overstay his welcome - and amusingly that's also the character's fear when he encounter peoples who are not put off by his condition : "You find it funny now, but we'll see if you feel the same way in a little while" - but it works somehow. I guess it's because it's played in several different ways and it's thematically linked with the plot (the jazz, the irrepressible need to find structure in chaos, to have things fall in the right place but also finding links and creating associations where others don't see them - a bit like the main character in Homeland is supposed to do and hardly ever does !).
On the flip side, the lack of budget shows in several scenes that have very weird cinematography and the plot uses a McGuffin - sure, why not - but does a very poor job at selling us on how important it is once we know what it is.