In a movie career that stretches back 25 years, Jennifer Lopez has on occasion done flaked-out underworld thriller romance (“Out of Sight”), capery action (“Parker”) and revenge (“Enough”). Yet she has never placed herself at the center of such a down-and-dirty, grimly overwrought, execute-now-and-ask-questions-later B-movie as “The Mother.” I’m tempted to call the film “minimalist,” because if you consider its bare-bones screenplay (by three writers!), its convoluted utilitarian set-up, its 2D villains, and its essential formulaic momentum, it’s a prime example of action filmmaking made basic.

Yet “The Mother” is a Netflix action movie, which means that it has a certain flavor of ambition mixed into its pulp stew. The movie, which should have been 90 minutes long (it’s 116), is lumpy and inflated, it’s sketchy yet a touch grandiose, and it’s full of tersely dramatized scenes that somehow feel overly broad. Lopez, as a military sniper turned...