I honestly don't know. The Darkness seems like a very polarizing game; you either loved it or didn't get it. I fall into the first camp, personally; I don't know why it wasn't rated higher. I mean, yeah, the online sucks, but it seems like it got knocked down a couple of notches for that, while Bioshock (ironically published by the same company) didn't even HAVE online, and still got rated exceptionally highly.
The campaign was amazing, and along with Bioshock, it really established 2K Games as a pioneer publisher in the area of "cinematic" games. Like Bioshock, The Darkness has no cutscenes except for when it makes sense to have cutscenes, and the storytelling benefits immensely from it. It also helps that the writing and voice acting are excellent all around, and the story itself is very impressive for a video game story.
Either way, The Darkness established Starbreeze Studios as one of my favorite development houses. They also developed the excellent Chronicles of Riddick game, as well as the underrated Enclave for Xbox.
Edit: And, looking at Wikipedia, it looks like The Darkness 2 is in development!!
"'Casual games' are something the 'Game Industry' invented to explain away the Wii success instead of actually listening or looking at what Nintendo did. There is no 'casual strategy' from Nintendo. 'Accessible strategy', yes, but ‘casual gamers’ is just the 'Game Industry''s polite way of saying what they feel: 'retarded gamers'."
-Sean Malstrom