I gave the movie a 5/10.
The visual effects were great, as were the action scenes.
But the story? Meh, I saw that "twist ending" coming from a mile away. As soon as Tom Cruise approached the "radioactive hot zone" and was in danger of being "cooked alive" from the radiation, I knew that the radiation was going to be some sort of hoax.
Maybe I'm expecting too much from these types of movies, but I was kinda hoping to be surprised at the end.