I played the demo. I have to say I liked it. Most reviews say that it gets tedious after the first hour, or so. Also, that the family angle is disposed of pretty quickly, which is somewhat curious.
The one flaw that is consistently highlighted (and I must admit, it annoyed me in the demo), is that when you drop your gun, enemies act like you never had one in the first place, and attack you. Until you raise it again. And so on. Weak AI.