I made my life much easier several years ago by skipping all tv-series with a continuing story.
I made the decision watching 5th or 6th episode of "Lost", when I learned there was a second season coming and a third being planned.
I saw some trailers of the Vikings and got sceptic, but it doesn't matter, 'cause I'll not watch it.
The vikings were a really interesting and fascinating slice of history. They were so much more than just bandits, even though they were also bandits. Well, most nations/tribes/peoples were bandits whenever they went abroad those days.
Had there been a camera attached to the mast of some of those boats!!!