Director Michael Bay’s “Ambulance” celebrates Los Angeles as a shining city build on a cloverleaf of speed, concrete, yelling, automatic gunfire (sorry, pal, not in the mood) and rugged American individualism on both sides of the law. At weird intervals the action cuts away to a fluttering faceful of U.S. flag, as a reminder of where we are and who we are, and what the movie’s selling: national pride in a certain kind of mediocre action picture. None of the collisions, Gatling gun massacres (again, not in the mood) or SWAT sniper stare-downs in “Ambulance” can compete with Jake Gyllenhaal’s po…
