No need to rehash the plot details. It's a revenge flick starring a wrongly-jailed guy whose wife and son were killed while he was in the slammer. Classic setup.
The dude seems pretty helpless until a psycho joins the effort to handle the essential mayhem. All the visceral kicks viewers seek from these flicks come from his gleefully sadistic dispatching of thugs as they move up the food chain to the next level of authority. Standard, gory plotline for such guilty-pleasure fare from any continent until a pretty unique, well-executed plot twist. The good sort of mayhem escalates until they jump the shark in the climactic battle.
Once they go too far with the psychological element, we're stuck with an adults-only spin on Looney Toons. Too bad they couldn't figure out a better way to wrap up this otherwise solid action offering.