Love the concept, but the writers clearly were too spineless to make good horror, too dumb to make good sci-fi and too dimwitted to make a a powerful statement. They tried and failed at all three of those things. Suffers from shitty dialogue syndome.
Gotta say that M3GAN's VFX, her design and the kid who played her were all amazing, so it was still kinda fun seeing her run around inflicting cartoon violence upon people.