When Harrison Ford first read lines for the role of Han Solo in the original STAR WARS, he remarked to George Lucas, "You can write this sh*t, George, but you can't say it." Ford's comment was aimed towards the prose of Lucas, which looks all right on the printed page, but sounds stilted and corny coming out of the mouths of actors on film. Anyone who has seen the STAR WARS films (particularly the Prequels) knows: dialog has never been George Lucas' strong suit, and some of the lines he writes for the characters are laughable because they include things that people would never say to each other.
Similarly, do you find lines in wuxia that look fine or even great on the printed page, but that you can hardly believe that the actors in wuxia adaptations can say with a straight face?