One does not expect high art from a movie about a human space alien and monster creature landing on Earth in the year 709 A.D., with said human alien having to team up with the Viking inhabitants to kill the monster.
But one also does not expect so much boredom, either. Most of the film is just damn dull. The best scenes involves a flashback that demonstrates the systematic annihilation of an alien species. The music and visuals in that scene are absolutely first-rate.
Then we're back to the boring Vikings again after that. The cast is decent, but no one in the film is terribly interesting or charismatic. The monster itself is effectively rendered, but not all that well-utilized. Given how tough it's shown to be, I'm not at all convinced the method with which it is killed would actually do the trick.