Running time: 145 minutes. Rated PG-13 (sequences of violence and action, and language.) In theaters.“We’re all stuck driving in the same s–tty circle,” says Michelle Rodriguez’s character Letty in “F9: The Fast Saga.” “And we’re never getting out.”Besides expressing Letty’s vague existential crisis, Rodriguez is also speaking for us cranky critics who wonder just how many more atrocious “Fast & Furious” movies we will be forced to endure.