HNation
Éireannach
For me, definitely Episode III: Revenge of the Sith. I love the tragic story, and I think the acting, lightsaber duels, and effects are all very well done. The scene on Mustafar is especially good. For all the flack George Lucas gets, the script really is excellent. "I have the high ground" and "you underestimate my power" are iconic memes for a reason. For those who say that Hayden Christensen can't act, he does a really good job of playing angry/evil Anakin, and the way he screams "I HATE YOU!" after being defeated is really quite powerful.
The first sequel was so bad I didn't even bother watching the next two. The arc of the character I actually cared about (Anakin) was already over, Return of the Jedi ended with all the plot threads wrapped up nicely, there was no reason to make the sequels other than as a blatant cash grab. They should have just done more stuff like the Obi-Wan Kenobi series instead.
The first sequel was so bad I didn't even bother watching the next two. The arc of the character I actually cared about (Anakin) was already over, Return of the Jedi ended with all the plot threads wrapped up nicely, there was no reason to make the sequels other than as a blatant cash grab. They should have just done more stuff like the Obi-Wan Kenobi series instead.