It's crazy how movies are getting done with such lousy scripts, seriously.
There's a lot of work here in terms of production, they even got a good bunch of actors, none of them was half as bad as the script!
Cinematography was good and the practical effects were decent for the genre.
But the script is mediocre from the beginning to the end, the story is nothing original, true, but it's just an excuse to see how the characters survive the situation, it's been done before, simple stories, clever script. This isn't clever at all. Dialogs, action, pace, characters... everything fails here in that department.
Totally wasted potential. Again, I can't imagine how this script got greenlighted, somebody of all the people reading it must have noticed how bad was the writing.
It's ok if you want a dumb watch, but I'm sure you can find easily something better.