You know this duel is probably one of the best in the Prequel Trilogy. But it suffers from bloat. It keeps moving from location to location trying to one up the action each time. It would have worked so much better if it ended in the second hallway with Vader being knocked over the rails into the lava shore at the end.
But it goes so long that the energy of the duel just dies. You go from Hype to sigh. I really like a lot of Revenge of the Sith but even it theaters I was "okay end" with this duel by the time they are on the floating platforms.