I've noticed that the 'Viking' shield in-game is too big.
Old viking shields came in a few sizes, and some of them were rather big. Not, however, as big as the one in-game. A standard shield would be aproximately 10-20% smaller, as can be seen in the following pictures, where reenactors have recreated the shields found archeologically:
All I'm saying is that the size should be reduced 10-20%
We can ignore the fact that they were painted and that the heavier ones were covered by rawhide.