At a time of strife, division, anxiety and war, you might think the moment would be right for a nostalgic escape to the retro-excessive trash-movie mystique of the ’90s — an age when action thrillers were big, loud, decadent, “rebellious” and, as often as not, ripped off from “Die Hard.” “Ambulance,” however, could make you rethink that impulse. It’s directed by Michael Bay, who over the years has trafficked in a great many varieties of excess: massively scaled kiddie gizmo excess (the “Transformers” films), apocalyptic sci-fi excess (“Armageddon”), fake-authentic historical excess (“Pearl Harbor”) and good old buddy-movie excess (“The Rock” and “Bad Boys”). “Ambulance,” a propulsively violent and in-your-face chase thriller, stakes out a genre we might simply call ’90s excess.
Set during one long day in Los Angeles, it’s…