I feel that the AI is very rough around the edges, there have been several instances where the enemies just stand and look at you and walk into trip mines etc. it's also way too easy to "sneak" up on them - they just fire continuously at where they last seen you and as long as you don't walk right in front of them they seem to have no sense of where you are. Also the way they react to things like grenades and sniping is a bit dubious as well as the fact that although they do make use of cover, they do so very ineffectively. They do show a lot of intelligence though, most of the time, I just believe it needs to be worked on a little and rounded off.