Basically they just go around murdering unarmed christians, then come back home and there's some drama, and then back to murdering unarmed christians.
None of the characters are like-able in the slightest. Vikings just win over and over and murder helpless christians. Then there's a big Viking court case and they Perry Mason their way out of whatever little drama happens. If your idea of great cinema doesn't extend past Transformers or 300 and some Walking Dead this is a great show for you.