Wow, I wasn't expecting a lot, but this movie is cool! Sure it uses all known elements from other films, but makes its own fun and interesting thing out of them.
Main actress, Allison Williams, is very beautiful, first time seeing her, and she's great.
Also it has to be said M3gan the 'doll' isn't at fault here, it's the psychotic angry little girl's influence, and people around them...
Favorite scene is when "Walk the Night" song starts playing, and M3gan dances for all of 3-5 seconds, walks awesomely, and grabs that paper cutter blade. For a brief moment the tune and montage of city views, and different places reminded me of an exciting feeling I had while watching Ghostbusters - that's what a nicely picked music can do, and why I say it's as important, as story and visuals in movies.