its funny, I always got the impression that George told the actors to act wooden; like as if he was trying to evoke a bygone era in the PT...I think back to Queen Amidalas forced and awkward sounding delivery and I can't fathom her coming up with that weird inflection on her own..It would make sense however for the Jedi to be monotone I suppose...they were sexless monks after all. And Hayden Christensen always gets flack for his portrayal of Anakin but again; GL wanted him to act like a petulant child and thats what comes across on screen in ep 2; I find him much more enjoyable and even likeable as a character in ROTS (the beginning anyways)
I doubt that George asked them to act 'wooden'. However when you see him direct the actors in de making of documentaries, he does direct how they should pronounce and stress certain words in a particular way he has in mind.
Some would call that bad directing because you're not really letting the actors do the work. But hey, if that's what you want, that's what you get. And in reality it's wooden acting...
yeah i suppose but most, if not all of the actors in the prequels have done great acting in other films so its not as if they are bad actors, they were directed a certain way and that reflected in their performances