I loved The Darkness, I rented it for 3 days until I finished it and I have to say I'm pretty satisfied. The graphics aren't bad at all Killerhz, I don't know if we've been playing the same game but The Darkness definitely looks good, maybe some posters and objects don't look very good but the textures and the lighting effects are beautiful. I agree that not everybody will like the shooting mechanics of the game but I like it, I also loved the Darkness's powers, especially the demon arm and the black hole.
Story wise it does a fantastic job, the voice acting is top notch and the story line is excellent, especially the twist where you go to hell, that's pretty good, especially the 2nd time around. I love when the Darkness speaks to you, the actor who did that voice is the best actor I have ever heard, in a video and maybe in movies too.
Anyways, I'm just telling those who wanted to buy it or rent it that it's not a bad game, in fact, it's a very good game, one of the best games I've played this year.