I think Hayden was the worst actor you could get to play Anakin. I was totally against Leonardo playing the part before, but after seeing Haydens appalling acting scenes, I'd wish Leonardo got the part instead (or any other actor who could deliver a line in a non-monotone voice, for that matter). The scenes at Lars place gave me shivers up my spine alright....makes me wanna throw up!
But lets not all blame it on Hayden. After all there's just so much an actor could do with the abysmal script writing of George Lucas.
I've said it before and I'll say it again; the old man has lost it.