We are going to see how the Duel on Mustafar is not such a big deal.
George Lucas wanted the duel to be really famous and highly anticipated.
It is, while he put a picture of it in every ROTS poster. But the duel has lots of errors:

1)It's speed. It is incredibly fast to show the savagery, but, in reality, it was done like this to impress fans. Fans are impressed, although the duel is a dance, not like a dance, but a dance. No people fight like that. The worst and funniest part of the duel is where they twirl their sabers around before pushing each other...Everybody laughed while watching this (admit it).

2)It's length. "Unbelievable. 12 minutes long...When will it end? " My thoughts while watching the duel. The critics on RottenTomatos.com complain about the length as well.

3)It's point. What's the point? It's two people that have been enemies for 3 days. They forget everything and duel. What? Vader doesn't even have a red saber...

So this is how the duel is not much of a duel, mostly a show-off. But no offense. The Force Push is great, and so is the immolation scene...
Unforgettable.

An interesting article:
http://starwars.wikia.com/wiki/Mustafar_duel

Other entries:
http://blogs.starwars.com/saberb/1