Revenge of the Sith had the corniest dialogue you can imagine. If you can sit through that and remain awake for the first 100 minutes, then you'll enjoy some of the snazziest action ever seen on screen. Starting with Obi-Wan doing Greivous harm, moving on to Anakin getting converted to the Dark Side and winding up with the fantastic duel over lava, the last 45 minutes made it all worthwhile. If you are someone who hasn't watched a single Star Wars film, I recommend skipping the first two episodes and walking in halfway into the third.