well, Saw, in comparison to the first movie remotely like it that comes to mind (Seven), was imo less stellar in the acting field, but i don't necessarily think it was what i'd call bad acting. brad pitt and morgan freeman and kevin spacey esp were just amazing in seven. Saw had stronger points in its story and twists than in its acting, and the more i thought about it afterward, the more i liked it. lots of things that seemed obvious would be a key point did turn out to play a part, but not the way you expected them to (trying to be vague, yet make a point here).
also, just finished Once Upon a Time in China, and may look for the trilogy as it was pretty decent. are the second two as good?