I'm amazed by some of the people on here that are saying the AI isn't true AI (or something to that effect) but rather just a series of questions or options that the NPC goes through/answers then follows.
What do you think true AI is?
AI is an algorithm that asks a bunch of different questions to guage the circumstances the NPC is under and then throws out the programmed response to the current situation. That's exactly what it is. What we mean is the AI doesn't necessarily seem to be reacting to us. The AI seems to more ask "am I near a window? If so, jump!" rather than "would jumping through a window be a useful tactic."
In other words, it doesn't seem as much to be intelligence as told to react to its enviroment. While still very cool, that's not as cool as evaluating whether or not the enviroment can truly help it.
This is probably most notable when it crawls underneath the bookshelf. Prone and unarmed, it's easy to blow away.