’72 Hours’ Review: Kevin Hart Tries to Be Down With the Kids in a Mediocre ‘Hangover’ Knockoff

Great comedies are in short supply these days, but “72 Hours” offers a reminder that a crime subplot can quickly ruin even a potentially average one. Directed by Tim Story (“Barbershop,” “Ride Along”) and written by Jon Hurwitz and Hayden Schlossberg (the “Harold & Kumar” trilogy, “American Reunion”), this latter-day “Hangover” retread did not need…