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Until the film condones cold-blooded premeditated murder, it's actually rather gripping, in a "switch your brain off and don't think about it" sort of way. The moment you apply any logic to the story or characters it falls to pieces. Mitch turns just far too deeply evil, for one thing. It seems frightfully convenient that Slim discovers her long-lost dad (Ward), who just happens to have enough spare cash lying around to rescue her, and to fund her high-tech vengeance scheme, which is so Hollywoodised that it isn't believable for a second. When J-Lo starts hearing the voice of her trainer (Young) in her head at the end, the audience erupts in guffaws! That said, the acting is very good. Lopez makes her character someone we can root for; she pretty much single-handedly carries us through the film. The supporting cast adds interest to the side characters that fills in the thin plot. And Apted keeps things slick and involving. Yes, this is efficient solid filmmaking, wrapped around an essentially reprehensible storyline. And it's startlingly entertaining unless you engage your brain.