Big Bad Sis might be an exploitation film, but it is a thrilling and well-directed exercise in the form. The storyline manages to be episodic and fast-paced all at once, cramming an exciting amount of character, action, and story into a compact running time. Big Bad Sis also offers some strong performances by Hong Kong action genre professionals: veteran Shaw Brothers actress Chen Ping makes an excellent tough-gal heroine, both in terms of acting skill and fighting ability, and the film offers her ample opportunities to use those abilities. There are also likeable supporting performances from Shaw Yin-Yin as a feisty co-worker and Wang Chung as the henchman who still carries a torch for the title character. However, the key hook of Big Bad Sis is Sun Chung's direction; he blazes through the story at a full-throttle pace, making a very precise use of odd camera angles, fast editing, and slow motion to pull the viewer into the action. The end result rolls right over the viewer like a freight train. In short, Big Bad Sis is not for all tastes, but exploitation fans will find that it offers cheap thrills of the first order.