I was rather suprised when I found out the Snurbles still heal / buff you, I guess because it wasn't a "Agressive" type of AI they didn't bother with it.
Also, slugs still passively AOE when you get near them at times. But other than that the monsters are rather bland and lifeless in the AI department. I mean seriously I want to see a malboro scooping up marmots in the forest!