There was no evolution of Vader as a character, and quite frankly I found it hard to accept that Vader at the end of Sith was the former Anakin Skywalker. He just came across as Vader from A new Hope.
Although not a movie and AFAIK not even technically considered Canon, James Luceno's "Dark Lord" novel helps show the transformation from Anakin to the fearsome Sith Lord and Jedi hunter that we see in the OT. It's a good read and also deals a little bit with some Jedi survivors (newly created characters) from Order 66 and how they adapt to the loss of the Order. Matthew Stover's novelization of ROTS also helps flesh out some of the reasoning for Anakin's ultimate betrayal of the Jedi Order and fall to the dark side better than what we see in the movie.
Figures. As always, the book is always better than the movie I'm afraid.
I need to read the book someday. Maybe it will soften my opinion of the movies by filling in the blanks. Still, a movie should stand on its own merits, and if Lucas failed to relay the essential subtleties in the book, then it's his fault for all the criticism concerning the prequels.
Thanks for that bit of info.
