In my opinion this series hit its peak after Ragnar passes away, which is somewhere during season 4. The seasons prior to his death for me were sometimes a hard watch (boring & melodramatic) I persevered because my personality doesn’t allow for me to start something and stop watching it half way, but boy am I happy I kept watching. I wasn’t a huge fan of the casting for Ragnar, I feel he was the wrong choice for several reasons but mainly I don’t like his acting style. His sons however were all brilliant, Ivar was an amazing actor in particular :)