I burned out on Vikings when it hit season 3. I ended up rewatching Gilmore Girls instead.
Another one you might like if you haven't seen it already is Spartacus. The first season and the prequel season are good. The second season... Well, it's alright. Plus, "Jupiter's cock!" is like one of the best expletives ever.
If your manhood can stand it, you might want to try Gilmore Girls. Seriously, it's one of the funniest shows I've ever seen. I would totally live in Star's Hollow. It's one of the ones Dad inadvertently got into because of me.