This movie is based on one of the later Parker novels by "Richard Stark" (Donald Westlake), Flashfire. Jason Statham steps into the role of the amoral antihero with no first name. (Previous actors playing Parker: Lee Marvin, Mel Gibson, Peter Coyote, Robert Duvall. It's made for tough guys.)
Parker is in on a heist at the Ohio State Fair with some thieves. (Right away you notice that Statham's Parker is kind of a softie compared to book-Parker, persuading a frightened security guard into cooperation instead of just shooting him.) But the caper goes well except for a diversionary fire set in the wrong place, leading to bystander casualties. Unfortunately, the gang plans to use the proceeds to finance an even bigger score. Parker objects, leading to serious violence and he's left for dead on the side of a lonely highway.
The end? Of course not. Parker recovers, and immediately sets out to track down the gang that betrayed him. Along the way he meets Leslie (J Lo!), a beautiful but failing real estate agent. She gets involved in his revenge plan, of course. (Otherwise they could have used a much cheaper actress in that role.) And there's an obligatory boob scene, but not J Lo.
It's not bad, not great. A good movie for an evening when there's no Red Sox game.