What a disappointment. Totally wasted potential. Cheap jump scares. Hyper-kinetic combat scenes. Piss poor CGI. Worse digital blood. Mindless, boring, and not particularly worth a shit. I was actually more bored when I left. I had more fun playing Pirates of the Caribbean 2 pinball in the lobby.
Don't waste your money - seriously. I could have gotten more use out of my money if I had wiped your ass with it - not even my own ass. If you want to see a movie with Vikings just watch The 13th Warrior.