James Norrington is good in PoTC1, bad in PoTC2, good again in PoTC3. Actually I like him to be bad in PoTC2.
Orlando's acting is not very good at the beginning. He stares A LOT. But as the movie goes on, you can't help feeling that he's much better(both in looking and acting). At the end of the movie, just one word: SEXY. I mean REALLY, VERY sexy, as a grown man. You'll know what I mean when you've seen the film. Far more sexier than his girl friend Miss Swan(Mrs. Turner).
But to be honest, PoTC3 is too long, and boring at the beginning. For common audience, it's very difficult to understand the plots. Not as good as PoTC1 and PoTC2. Bigger, but not better.