I will go on a limb saying that the only flaw in Black Mask II was the action wasn't good enough. Andy On, who replaces Jet Li, bounced off walls too much and not enough physical action, even in his finale against Lang (martial artist Scott Adkins). I also felt Rob Van Dam did some nifty moves that you would expect but he was pretty much wasted as Claw. Other than that, you may as well called this "Guyver 3" except instead of Black Mask, put the Japanese superhero Guyver in his place. Cuz that's what the result was.

UPDATE: Who would have known that three cast members from this film would go on to play horror movie icons. There's Tobin Bell (Jigsaw from the Saw films), Michael Bailey Smith (Pluto in the Hills Have Eyes remake and Hades in the sequel), and Andrew Bryniarski (Leatherface in the remake of Texas Chainsaw Massacre and its 2006 prequel) appeared as the evil Moloch, wrestler Ross and Iguana respectively.

Andy On has since gone on to better things, but this is quite an interesting look at one of his 1st movie roles and to see the three aforementioned future horror icons.