The game doesn't end after finishing the main quest, right?
Would you mind answering my question? I'm really curious about that.
Haven't really had a chance to test it (I put traps in doorways and lure the enemies over them, rather than trying to use them as chokepoints), but I think it's the same as in the previous game. But at least now warriors can learn a 'Taunt' skill that alleviates the 'issue' a bit. Then again, enemies run through party members in Dragon Age as well...