The monsters in JADE look like they'll be more fleshed out compared to ADOM, in that they will have inventories, goals, wield items, etc. I feel that there should be a corresponding increase in Monster AI.
The first issue is formations. Let's say you're in a cavernous level and come across 6 orcs. In most rpg video games that are turn based, the orcs will come out you from the same direction. Since they have te same speed, the closest one to you will reach you first, and you will slaughter then one by one. This is quite unrealistic: mobs, especially composed of cowardly creatures, would charge at you in a line, perpendicular to their motion of direction, so that the wall of monsters would wrap around you when they reached you so they could fight simultaneously. I hope that made sense.
The next issue in corridors. In every single fight in Adom where possible, I fall back into corridors to slaughter monsters one at a time. Now, I understand this working on rats or zombies. But on sentient creatures like orcs or what not, one would expect them to fall back, since a corridor negates their mob advantage.
The next issue is spell casters. Most spell casting monsters in ADOM just randomly blast spells at you. I think mages should be more sophisticated. Say a chaos wizard blasts fire at you, and your ring of fire resistance wards it off. Presumably the wizard would realize this, and try another spell. Basically, spellcasters should cycle spells randomly, and settle on the one the PC is most vulnerable to.
Any one have other AI thoughts?