In general, everyone tends to agree that the props, wardrobe and sets are about as accurate as it's possible to make them in a television production.
However, there's one issue associated with the show that seems to have divided viewers pretty evenly.
The presence of women warriors in the series is the sticking point. Some people believe they existed in Norse society. Others don't think it probable.
I first came across this a long time ago when I was reading about the Norse , their culture and customs. They had influence all the way into Western Russia (the Easterlings), all the way to North America, and down into the Mediterranean lands. They were a major presence in England from the late 700's until Stamford Bridge in 1066. Historians know a lot about them because they left behind many well preserved settlements (York was the Viking capital in England and the Viking remnants there are still being excavated.) They left many graves and ship burials which preserved significant quantities of their artifacts. They also had stories that told the histories of their people, called the sagas. The Norse sagas clearly state that there were "Shield Maidens." But archaeological evidence is scant and subject to interpretation.
The idea of women warriors at first seemed ludicrous to me. There may be some unusually big, strong women who could hold their own in hand to hand combat, but they would have had to be rare. Men are physically stronger than women in general. In those days, you didn't snipe at people from 500 yards, you stood within feet of them and flailed away with heavy weapons. How, I thought, could a woman possible hold her ground against men in that environment. It seemed very unlikely.
My brother who had been a policeman told me not to underestimate how strong a woman in a fury can be. He said he'd had more trouble containing them than with men, because unlike most men a woman in a rage doesn't know when to stop and just keeps coming.
A security guard at a hospital told me the same thing. He hated female 1013 cases more than male cases. 1013 means drug crazed, or mentally disturbed. Women out of control were harder to handle than men in the same situation. Partially I suspect that with both the guard and my brother, this is because they had instinctive reservations about using strong force on women, and none at all about using strong force on men. "Strong force" implies a beat down. But it does provide a clue to the overall question of whether or not there could have been women warriors in the time of the Vikings.
I am going to put some links here that discuss the idea. Anyone who wants to do the same , either for or against the idea, or to give their thoughts on the question is welcome to do so.
As an aside, although I think Shield Maidens were a historical fact, I don't in principle approve of women being involved in combat, for a multiplicity of very good reasons. Putting women on a modern battlefield in combat roles is sick, and it's almost always espoused by people who have never been there themselves and are politically motivated, pushing their own agenda regardless of the consequences to others.