The problem with the new AI is that there's no player control.
You need either a hard or a soft method of control in all class-based games like DOS because otherwise the AI plays like a player...they go for the weak targets first and there's nothing you can do about it.
Soft Control: Heavy targets at the front, tank-y classes initiate fights, players have ample opportunity to physically block the path of AI.
Hard Control: Taunt(obviously).
Also, they have a 'taunted' effect. Why can't players taunt?