Gerard Johnstone's "M3GAN" became an internet sensation after the trailer showed an android doll dancing in a hallway, but when critics finally saw the whole film they recognized it as much more than a meme. Gerard Johnstone's "M3GAN" is a smart and emotionally mature motion picture about a young person trying to avoid dealing with the realities of death by glomming onto high-tech robotics and artificial intelligence in the form of an automaton that, before long, goes on a killing spree and...