I just watched this the other night, it was a pretty cool movie, reminded me a little bit of Robocop. Even though I kind of figured the plot out early on, I just didn't guess the twist at the end. Although the twist kind of created a big plot hole in the story...
I did think a few of the violent scenes were a bit gratuitous, they could of toned them down and got a PG-13 rating given there was very little cussing and no sex or nude scenes... I think a PG-13 rating would of brought in more money....