Sith finishes off the three digitally dominated creations from George Lucas. It is the best of the three, easily, but cannot touch the originals with a 1138 foot lightsaber. The lines are still bad, the love story still boring. I mean, how many times do you chuckle during the original movies, when you are just bored during the new ones.
Action, however, is great. Best to just sit back and watch, and not get involved with the dialogue at all. R2 kicks ass. Anakin turns to evil. The Jedi fall.
The trouble with each of these first three movies is centers on the fallacy of explanation. We really don't need to see how Anakin is discovered, grows, and turns. We just need to understand that Darth is evil, Luke is good, and lets make a movie. The same fallacy creeps into The Matrix trilogy, trying to explain something, or ground in reality, a history we just don't need explained. The upcoming movie, Batman Begins, gets into the origins of Batman. Do we need that? It may work given that its the history of one human, and not a history of a saga set a long time ago, in a galaxy far, far away. I'd rather know that there's a Batman, and he's going to kick Jack Nicholson's ass.