First off, don't put down the Fett man. He's one of the best characters in the OT.
Vader was whiny in ROTS. That just killed it for me when he did the line. "NOOOOOO!!!!!!!!!!!!!!!!"
No sith in the movies can amount up to Darth Maul. I don't see how you can deny that he has potential.
Liam Nesson did make Qui-Gon cool. I still think it would've been cool to see more of him in the movies.