Director Brett Ratner's "Hercules" respects your time and your bloodlust. It slices through 97 insanely violent PG-13-rated minutes in a sort of extended digital blurt, pausing just often enough for Dwayne Johnson to reload his guns (not that kind, the other kind), or for John Hurt (as the king of Thrace) to rasp "Unleash the wolves!" because Liam Neeson already said "Release the Kraken!" in the "Clash of the Titans" remake.