Bad acting, poor stunts, horrible effects, sorry dialogue. Low range of entertainment.
The plot is pretty simple, and the story is believable. It is just executed very poorly resulting in a bad product.
I am a big fan of the TV series Black Sails, and my guess is that it is due to his role herein that Tom Hopper got this movie. In Black Sails he does a good job and is among my favorite part of the cast. In this movie he seems awkward and absent most of the time. I have added the tag for "bare chested male" despite it not being an important part of the move. However, he had such a hard time keeping his shirt on during the first part of the movie, that I thought it would be appropriate.
I watched it without much enjoyment. Unless you really want to see Tom Hopper jump around with his shirt of, you should find something else.