I was expecting more from this movie, but it turned out to be a big disappointment.
First of all Vikings in this movie were represented more like an animals, acting like a rabid animals rather than humans and Vikings we have seen in popular TV shows, but the reason why I'm giving such a low score to this movie is simple - boredom.
Character development was poor. I didn't care for any of them. Story was a typical vengeance story, nothing special or unique and the movie itself was very slow, lacking action and I almost fell a sleep. At first it seemed a realistic movie, but then they started putting supernatural things, so it wasn't realistic, but wasn't a typical unrealistic movie (like Marvel and DC) either. It was just a poor attempt of mixed jumble. It's sad to see such a great actors wasted in this boring movie, but even they couldn't save it if script was so poorly written and executed.