Don't be put off by this game's graphics, because it's a gem of creativity, atmosphere and brilliant voice acting!
Let me put it straight- this game is difficult to describe. But one word would round it all- creativeness. Even the side quests are really funny in a good way, not talking about the main storyline which kept me glued to the game.
I highly recommend this game for those who like "different shooters", good story, atmosphere and some unexpected locations (like hell or haunted house)
P.S. There's a comics book "The Darkness Ultimate Collection" that was released after the game. I recommend this one as well :)