As with most martial arts films, its hard to have a meaningful plot, the fighting always steals the show OB is no exception and thats not a bad thing, lets face it we only watch this sort of film for the action anyway
If you want a decent story try "Hero", for awesome action and fight sequences OB takes the prize!
A possible downside is its in Thai, with english subtitles, thats it.
Otherwise OB \ OBWK are fantastic films, there is no CGI, No Wirework and lots of "thats gotta hurt" moments.
Buy it, buy it now!!