Before getting to “Army of Thieves,” it’s fair to ask why Netflix and producer Zack Snyder felt compelled to make a prequel to the zombie/heist mashup “Army of the Dead,” which doesn’t really demand its own cinematic universe. This more conventional heist yarn somewhat stands alone, but hardly feels like it has the right combination to merit this exercise.
‘Army of Thieves’ unlocks a prequel that doesn’t steal much
