Except that the way Hayden delivered it, it seemed more like a four year old throwing a temper tantrum after being put in time out rather than a turncoat possessed by unquenchable rage.
For his portrayal of what George wanted (a creepy, leery, whiny, bratty, self-absorbed sociopath), I'd give him a 4.5. Mediocre job. He did manage to be plenty creepy, whiny, bratty, and self-absorbed, but the woodenness with which he delivers virtually all of his lines makes him adequate and forgettable at best.
For his portral of Anakin Skywalker as described in the OT and Darth Vader as depicted in the OT, I'm with C3PX and SkyJedi: -10, maybe even -11. Deplorable representation totally untrue to the character previously developed. I can live with a few minor continuity errors, but I hate how they butcher Anakin's character in this trainwreck of a trilogy. Better to forget the PT ever existed than to watch the OT and try to reconcile the two Anakins, as well as the two Vaders.