Speaking of bad actoring. It's one of the many roles Hayden has been getting. Even in the movie Jumper, his role was a bit bad and out shined by the supporting actor. He's got some potential though.. I see it. He just needs much more serious roles.
As someone who has done acting and worked with a couple bad directors, I'd say the consistently wooden and sterile delivery of lines in the prequel films leaves little doubt as to who is to blame. It can only be Lucas's direction, and the flat delivery is a deliberate homage to 40's serials. It might sound good on paper, but in practice, it is ugly to behold (unless intentionally used for comedic effect).
Some directors give their actors very little in the way of direction, and certain actors flourish under those circumstances. Other actors need some direction to be at their best (I am one). But the worst kind of director is the director who gives bad direction to his actors, and this is Lucas in spades. It's better to get no direction than bad direction.
I haven't seen much of Hayden Christensen, but I have no doubt that he, and everyone else in the Star Wars films, is capable of much, much better than those films would lead one to believe.
Jake Lloyd get's a lot of flack for his performance as young Anakin, but look at the performances of the advlt actors. Ewan McGregor, Liam Neeson, Natalie Portman... these actors have shown in other films that they are better than this. If Lucas's direction caused those actors to give lifeless, flat performances, what chance did poor little Jake Lloyd have?
Thus, if this Disney buy-out means that Lucas will not be directing, then the Star Wars films can only get better. I honestly do not see how they could get worse.