I gave it a higher rating then it deserves but this is to offset the lower ratings for which it does not deserve. A tale of vikings raiding saxon territory, and the viking leader seeking a book which is supposed to be a holy relic of Christ as he feels it has power which he can use for his own advantage. The story follows the young monk who is the only survivor of a monastery where the book was kept, and his flight from the vikings. He is aided by a British warrior nobleman, and later on another (I leave unnoted so as to not spoil).
There are a few moments where it plods a touch, but overall I thought it well done. It is brutal in parts, but back in 733AD (when this takes place - part of the dark ages) it was brutal times. I thought the acting was good, the cinematography very good and it had gripping moments. Most of what happens is I think fairly predictable, but how many movies are not? There are always flaws in movies, but I think the ones in the movie can be overlooked plot wise. I have watched a thousand movies rated 5-6 that were not as good as this one at it current 3.5 rating, so I have no idea what the panning is about.
Just be advised, this is not a movie for children. There are brutal scenes of violence (and more) in the movie - entirely keeping within the character of the times and setting but stark just the same.
The published plot line indicates this movie is based upon a true story, or at least some sort of folklore. I have no idea of the accuracy or merit of that contention, and it seems to me it really does not matter.