I say a 4. While I thought he had the right look, he certainly didn't have the right lines, the right director, or the right story.
Feel free to rate other actors.
Ewan McGreggor as Obi Wan, I would say about a 7.
Again, he had the right look but the wrong everything else. His lines certainly were not as bad as Hayden's.
Actually, I don't really have a problem with any of the casting in the PT, yes, including Samuel Jackson! It was all about the script.