At the end of the day, Viking is a game that tries to accomplish a lot, but only manages a little. The combat feels severely under-cooked, there's far too much relentless, on-foot travel and the story gives you absolutely no reason to care about how things will turn out for Skarin and the Vikings. There's no motivation to keep you playing, apart from some rather easy to earn achievement points.
The few portions of the game that deliver genuine excitement, the large-scale battles, only make up about 10 percent of the game's overall 12 – 15 hours of play-time. Viking surely isn't worth the full price of admission, at $60, so it's strictly a rental at best. And that's only if you're someone who's not overly picky about what you play.