There have certainly been improvements, but I feel that most of them are bug fixes or unintended behaviors. I am hoping that at some point their movement and strategy is improved. They behave the same as in Source Insurgency: they walk a straight line to the most recent contact with a player or objective.
I can only imagine how hard switching to Unreal was, but I would like for them to be a bit more sophisticated eventually... using cover, flanking, and not charging through a lit molotov.