Endless, irritating movie. Some good special effects try to cover for a limp story, crappy dialogue and shameless over acting. 

And Hayden Christensen in the lead role sets a new gold standard in bad acting.  He couldn't act dead if someone shot him.

After the first two deliveries, the Revenge of the Sith was quite welcomed, especially in the masterful manner in which Lucas made the story fit perfectly with the Star Wars IV. Honestly, before the movie was released, I had problems trying to figure our how to make a story fit into another story conceived 3 decades before. But Lucas did it in a spectacular way. Of the 3, this is the one I enjoyed the most.

Mace vs Palpy, Obi vs Anakin, and Order 66. Who wouldn't like this one.

Best fight scenes of any of the Star Wars movies, even if it doesn't quite stand up to the Original Trilogy.