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Understanding the AI's behavior and knowing where it will move (using a wall of fire) are important. However, there's a lack of variety in the spells available to companions, and the tactics are monotonous (a clone of the Archangel, using blindness and debuffs with zero losses). The value of spells is also an issue (speed and slow, berserk and blindness account for 90% of the spells used in combat... while things like mirror image, sacrifice, and magic resistance are less common), which creates a very unpleasant gaming experience. It used to be so much more fun without this element of obsessive optimization.
Recently, good battles have been those on cursed ground, where there's a trade-off of strength.