I think you're being somewhat unfair to Ron Ng (and Lang Huet).
Given his very limited screen time and the aloofness of Lang Huet, he does remarkably well. Sammul Chan's job was a lot easier.
Lang Huet doesn't have much of a story (and was unfortunate enough to get hooked up with the most annoying female character I've seen since XLN ) - but he IMHO made his presence felt. I quite appreciated all those brief but important displays of loyalty and determination.
Lang Huet was by no means boring. (At least as far as I'm concerned...;-))