Some games do have different behaviors for different enemies, I can't really point to any one modern game off the top of my head. However, I do remember the first Half-Life touting that as a major feature and it being cool to experience back when that game first came out. I remember some enemies would throw your grenades back at you or fall back and regroup, some would just run straight at you, and others would attempt to sneak around and flank you.

My hatred for other humans, especially in their online multiplayer behavior, faaaaar outweighs what you brought up.