i think the AI is plenty smart. some fallen even have a teleport dodge which always catches me by surprise. as to following into rooms go, I respect it. coz many a times I was bein slaughtered and to my relief I could go hide and recover and reload while the enemies waited. the thing that bothers me is that on hard the enemies are sponges. not much else. no new attacks per se and no variety like hallowed or elder types. only greater level and greater hp