You've got to love this film for it comes in at the peak of its genre: mindless, eye-candy action entertainment.
Vin Diesel acts as well as he needs to, the stunt doubles do the rest of the work (yup, a page and a half of stuntment, four columns wide) while the special effects fill in the background.
Explosions! A plot to throw the world into chaos! Gadgets! Fast cars! Attitude!
It's a badboy James Bond movie for the current generation. Just don't go expecting your cerebellum to pulse with the thrill of an intellectual challenge.