In PoE, especially as I get lower in the Paths or White March, my party increasingly fails to attack opponents. Most often the reason is that one party member is engaged and the rest can't decided if they should sidestep him from the left or right, and either get stuck on the party member trying to run through him or stutter back and forth. Trying to click behind an obstacle is also a problem as again the AI can't move around the obstacle, again incapable of making up its mind which way round it should go.