Note the first: Expect this review to include SPOILERS. Not that there’s a whole lot to it that isn’t fed to you by the trailer, but still. Stop reading now if you want to remain somewhat surprised.
Note the second: This movie is not high cinema. Don’t let Guillermo del Toro’s name on the onesheet fool you — you’re not going to leave the theatre saying, “I think the way the ferocious glowing aliens came through a rift in the ocean floor represents our own inner ambiguity about our place in a changing world.” You’re going to leave saying, “MONSTER ROBOT GRR KABOOM!” Because that’s what the movie is about.