Compared to the movie version of the film, the extended cut (on dvd) is much better and a fuller movie. It gives time for explanations and depth. If you liked it on big screen, you're gonna love the extended cut.
On its own, though, the theatrical version is already an almost perfect movie. Depth, dedication, faith - and the loss. Battle, cruelty, love, loyalty. What are we fighting for in this world? And is it really worth the fight - and the sacrifices?
The journey of Balian turning from a blacksmith into a knight is portrayed as if it took only a while, which feels rushed in comparison to the rest of the movie. When this matter is settled, the rest is one enjoyable ride; a beautiful, bloody ride.