Some of the action sequences are insane. No, really. Absurd, impossible, physics defying, triage-required stuff. No matter. That's the foolish rush of a franchise that must go faster and faster and furiouser and furiouser.
Just as the plot threatens to run out of gas, Lin rescues the film with a spate of vastly ridiculous and therefore enjoyable set-pieces, most of which involve means of conveyance designed to make the cars look puny.