I did see the movie and did think it was very good, but the only issue I raised against it was that similar to Romeo must die the fact that the combat was no way possible mae at least some sense in the Matrix setting on the grounds that it was all meant to be fake. None the less a great movie that could counter disbelief with quality...
The way in which the fights were choreographed in CTHD was very theatrical. A lot of the film was based around training in Wudan, and those who learned the art were granted weightlessness, superb. Kind of like those dreams you have when you suddenly realize you can fly. It wasn't like the film 'tried to get away with it' either, as many old Hong Kong action movies tried to do. Main character leaps 70 feet into the air, or his aunt or his grandma does, cos everyone can!
I'd have to see it again to agree about the conservation of momentum thing, That manouver Jen performs which impressed Li Bu Mai suggests that's no the case (i.e mid air change in direction of momentum, with no body to provide a reaction force on her to propell her in a different direction, she just seemed to fly further upwards).