"The AI in Quake 4 has been beefed up considerably over the previous games. It could be easily comparable to if not much more improved than Halflife 2. The Strogg warriors don’t want to die any more than you do, and they’ll move, take cover, or switch up their attack methods however they see fit to survive. I don’t want to give too much away, but I can definitely verify that you won’t live to see the end of the game if you stick to the more primitive method of standing still and unloading your clip on an incoming enemy. Some Strogg can even change over to melee attacks once they’re within a certain range."