It really is 4 hours... damn.
I would say this is a better playing game over The Darkness but it's not as interesting of a game. The Darkness took you to some pretty cool locals (like HELL WWII). Darkness 2's locations are a bit boring beyond the final level.
Good storyline. Wish there had been some more confrontation at the end between: spoiler (click to show/hide)
Jackie and The Darkness. Like, maybe you FIGHT Mike Patton or something.
The ending was still satisfying though, but I think it only works if there's a guaranteed sequel since it leaves you hanging. Then again I keep forgetting single player DLC...
pretty good game overall. 4/5