I saw Revenge of the Sith for the second time last Saturday, at the 10am show (I didn't even know any place opened movies that early). The opening scene worked much better for me the second time around, serving both as a solid Star Wars action sequence and to set up a positive relationship between Anakin and Obiwan. I'll leave general critiques aside for additional viewings, but this is a good offering.
Some IMDB trivia for Revenge of the Sith, not corroborated with any outside sources:
Francis Ford Coppola suggested Christopher Neil to George Lucas to be the dialogue coach. Lucas said that given the emotional intensity of Revenge of the Sith, and the fact that he rarely has time to converse with the actors, it would be ideal for someone else to be there to get the strongest performances possible.
George Lucas allowed his friend Steven Spielberg to design some of the action sequences, including Yoda's duel with Darth Sidious, and Obi-Wan's fight with General Grievous. Spielberg also consulted on other scenes, such as the climactic battle between Obi-Wan and Anakin.
Interesting.