Quite nice.
Well, I was during the third mission in campaign, and was about to kick all those cpu team members in their thick asses, when something happened and game just hunged(!) This guy was planning to throw a grenade towards me, but it just hanged.
I think damage areas of the head are smaller than the image of the head, what You can see when trying to shoot the guy standing next to You. Quite nice game though, It provides the base functionality of the Worms-style battle system. Music in the first map is so agresive 8D. AI players in most cases shoot the floor with the rifle.