From the time that I spent with the KZ2 demo ( I played the demo), The AI is very dynamic ! Good or bad is subjective but one thing is sure, The AI reconfigures itself with every bullet fired. I was firing at a Helghast and he turned towards me to fire, but at the same moment, another ISA fired at him from the side, so turned back at him anf fired at him while I reloaded. Then, while they were duelling it out, he had to reload, and I fired at himat that instant. Watching him take hits(Animations are really well done) while reloading and changing directions for the hits he recieved from me and the other ISA was really fun. He had no place to take cover and died, but he didn't feel dumb at all. Instead it was a lot of fun to watch him shift targets and fire at both of his enemies.
Frankly speaking, their animations were too good and they already felt "intelligent" due to that. What was he most fun in watching the Helghast in the whole demo was the way they changed decisions depending on your position and your bullets. A helghast is charging towards you, when suddenlny you come out of cover (finished reloading), He sees you out and runs back to cover is fun to watch. Though there is another Helghast behing him firing rockets at you only adds to the fun
!!