I agree with that, but a director is usually the one that has to guide the actor and get the best that they have out of them. But hearing things like Lucas giving advice to actors like "Alright, that was good, do it again now, but better this time." Even the best actor would be baffled on what to do.
And in Hayden's defense, I recently saw "Life as a House" which was shot before AotC, and I have to admit, he actually gave a good acting performance in there. So he has the talent, but he probably needs a good director to get it out of him due to his relative inexperience compared to the powerhouses like Mcdiarmid and Samuel L. Jackson and a few other names.