I've seen it. It's a good movie in the sense that it makes you wanna jump right into the screen and start snapping necks!
But it's not a "light" movie, it's actually very depressing (at least i felt so) and you shouldn't watch it if you can't handle torture/violence.
At the end of the day the movie made "feel" at least something, compared to the rest of the !@#$ movies they make this days, so it's overall a good movie IMHO.