It is “extreme”. Go doe some research, the show succeeded just by making you do so.
Our culture is/was not much different. We have/had different god(s) to worship and we force(d) our beliefs on others true (holy) wars.
We murdered and raped in the name of our God and took riches that didn´t belong to us.
We watched a show recently that showed the life of a executioner (medieval times), what evil deeds we are able to do upon each other…
I´m not trying to convince you to keep watching the series, do as you please.
I like it and have it on dvd.
Floki is awesome in it and his part in the story gets bigger
Have a great day.