I am a fan of the style and aesthetics myself, as a mid-30s never-stopped-reading-comics guy. As knightly said, lots of good examples (nod to Sanctuary, which started as a no-budget webseries that got picked up into a low-budget Syfy show. Not a great show, but it has it's moments).
If you're doing that, you are going for a niche market (that's not a bad thing) Might be good to look into that market, see what people like and dislike, and what they're looking for in a show. I think that's largely the comic book crowd, though I'd guess more people watched Sin City than read it. Furthermore, there's a whole comic book genre for crime/noir type stuff. I particularly dug Torso; worth looking into to get some ideas. And of course, if you haven't read Sin City (or even The Crow), I'd definitely recommend giving it a read, and compare how it translated into the screen.
All that said, I agree that gritty might not be the best adjective; that implies a degree of realism, and the style leans towards a hyper-realism. Either way, I'd find it interesting and be more inclined to watch it than another crime show, but I tend not to like them. There's my geek-biased two cents!