Possibly the most meaningful in the series

Rating: 10/10 (21 May 2005)

Might contain spoilers if you haven't seen Episodes 4,5, or 6. But I don't think I wrote anything directly shown in Episode III: Revenge of the Sith.
ROTS had the greatest emotional impact on me of all of the Star Wars films. I teared up during many scenes, but especially at the end. Just knowing Anakin's fate creates that much more sadness in your heart when you see his struggle to do what is right. We see Anakin like never before. All of the cast did an excellent job. This film is symbolic of many different things on many different levels. One thing it does teach us is that, in a Star Wars analogy, we cannot ignore the dark side, yet we cannot embrace it. We must always be knowledgeable of it yet never seek to use it's powers for evil. I believe that the major reason that Anakin does fall is that many of the Jedi simply didn't concern themselves too much with his feelings towards his training/etc. Instead of talking to him about it and possibly performing some taboo act of compassion, they shut him out and thus made him that much more angry. They were more used to padawans and apprentices simply acting very noble and taking orders very well. Even though Anakin was pretty arrogant, he still tried to do what was right according to the light side.
Many people claim that Lucas has a plot hole with the "prophecy of the chosen one bringing balance to the force." The one of course being Anakin. They claim that Anakin does not bring balance because he falls to the dark side. This is not true, it just doesn't happen when the Jedi Council thinks it will. It happens nearly 35-40 years later when Luke is being electrocuted by the Emperor. Anakin realizes that Luke is much stronger and resistant to the Emperor than he ever was, and sets in motion some type of ambition to redeem himself for all of the Jedi. So Anakin does bring balance back to the force.
Volumes of books and movies could be created just talking about all of the different meanings and symbols within ROTS, but it would be better for you if you just went and saw it.