For those who haven't seen it, a brief summarization...
Jet Li plays a killer hunting down versions of himself in multiple dimensions to murder them and obtain godlike power, while being chased by Delroy Lindo and Jason Statham; who surprisingly performs no hand-to-hand fighting in the film.
The build to the climax goes in typical fair. After killing the wife of Gabe Law (Good Jet Li), Lawless (Evil Jet Li) is hunted down at a factory where the final battle takes place while Jason Statham finds a way to transport Lawless back for incarceration. Both Laws end up transported, and after the "Which One is Which" Trope, Lawless is captured.
But the ending is where it shines. After being told Gabe would be sent back to his dimension, Statham protests; stating that his wife is dead and he'd be a wanted man due to Lawless going Modded GTA on his world. So instead, they actually send him back in time to when he witnessed a dog in an accident. Taking him to a conveniently nearby vet, he spots the doctor inside as his once and future wife, and realizes that he gets to relive his life with her all over again. Meanwhile, Lawless is sent to a Prison Dimension, where Jet Li possibly delivers his most badass line of his cinema history ("I am NOBODY'S bitch! You...are mine!") and fights a near-unending legion of prisoners on top of a pyramid as the camera zooms out and the most appropriate Papa Roach song plays the movie out.
It may have borrowed elements and been nonsensical, but it knew how to go out on a High and Epic note.