Very intriguing in the beginning and ropes you in until the train crash. Things go downhill from there and become random and hard to understand. It also tries to be everything at once: horror, mystery, action, thriller, natural disaster, alien, you name it.
By the ending you'll wish you hadn't waisted your time. Also (spoiler) everyone dies but the kids. The "chosen ones" if you will. Because they like bunnies.
From a Christian perspective this is blasphemous and disrespectful. Plays at aliens being gods or angels and are the ones in control. Even goes so far as to have the last scene be of the boy and girl in an Eden like setting running towards a golden "tree of life".
Definitely a waste of time.