The developers used popular tactics that the we, the players, were using while playing the original version, and implemented those tactics to the enemy AI.. Youll see alot of team buffing prior to atacking, or positioning, and CC.. Most notable would be the use of grenades, arrows, and potions..
Thats not to say they are perfect.. I see alot of wasted AP by walking out, and right back, only to end turn.. Or AOE to hit 1 of my party, along with several of there own..Ive also seen them run through environment effects..
But, overall its far better.. The amount of healing, potions, buffing, debuffing, CC, and use of grenades and arrows is wonderful.. The few hiccups in the AI is very minor by comparison.. They really are playing like players.. As far as spell choices go..