How bad is it? Completely silly, it may not translate well. It's not awful.
Should you see it? If kung fu hip hop sounds like your kind of thing, sure.
I'm told the title is a pun on the Chinese for "Fists of Fury," but my Mandarin's not good enough to say and I think it's Cantonese anyway. Guy tries to raise money for an operation to restore his sister's sight when he gets discovered as a dancer. The martial arts-inspired dance moves are okay and the film appears to be a gentle parody of the "Step-Up" type of film. There's one song in English.