Yeah, there's that with one or two enemies attacking the tank and the rest of the enemies in a line behind.
example:
But I'm actually talking about ring around the rosey.
Example:
I had a better example but forgot to save the screen shots as my ranged characters were nearly against my tank but the enemies kept targeting my tank. Also, my other characters aren't wearing any armour. I was able to move my other characters down below the crane and mop up all the wizards and continue around and then help out the tank. Pretty easy fight when the enemy concentrates on one character (tank) and ignores the rest of your party. Hopefully a modder will put in some enemy AI scripts to attack more than one person.
Okay, I have a better example below. Following the yellow arrow, Lady Valtas completely ignores my other party members who aren't wearing any armour and goes around and attacks my tank. I'm not even trying to exploit the A.I.
FYI I just uploaded IEMod 1.11 where I've attempted to improve this. The AI is more proactive about switching to a different target when it is having trouble reaching its current target. There are still times when an enemy will just inexplicably stand there doing nothing--I've not yet tracked down the cause of that. But it does seem to play less ring-around-the-rosey now.