I anticipate upping my ranking to a ten by the finish of this one. Yet another manga for which I breathlessly await the next release.
I'm going through a Viking phase right now. So my preference for this manga is probably a little biased. I don't know much about the actual history of the Viking invasions of England, but the clothing, ships, housing, weapons, and details of day to day life have been rendered with fair accuracy in Vinland Saga.
The fighting, maybe a little over the top, yeah, especially the horse punching episode. Still, I didn't find the gore to be excessive. When I picked this book up my biggest worry was that it would be one long slaughterfest full of lovingly drawn images of blood pumping from cloven torsos. When it comes to Vikings, it's especially easy to glorify the violent aspects and gloss over the reality of such acts with a load of heroic pap. Vinland Saga doesn't do that. Many battles are portrayed as are heroic intentions. I think what balances it out is that all the battles arise out of strategic context, and motives from greed to stupidity to nation building, to ideology, to revenge are portrayed. The characters fight for good and bad reasons, and the characters are rounded enough so that you can really sympathize with their choices.
I've read a lot of shounen/seinen where the young warrior character gets idealized as some pinnacle of manhood and the reader gets a load of poorly supported philosophizing that comes across as justification for being a thoughtless brat who "solves" complex problems with violence. I also worried that Vinland Saga would follow this formula. Fortunately, this story is nothing like that. Yukimura Makoto philosophizes about war in a mature and complex way. He does not beat his reader with a moral hammer or dissolve into sentimentality. He is building a construct of a "true warrior," but he's been adding layers for 58 chapters now, I don't quite know where he's going with it, and I remain immensely engaged with his ideas.
There's also plenty of between battle content that fleshes out the political situation of the time as well as the various cultures of Iceland, Denmark, England, and Wales. Yukimura handles pacing fairly well, interspersing these scenes with the battles in a way that keeps the story flowing evenly. The plot moves along nicely but never feels so rushed that you can't take in the scenery.
I picked up Vinland Saga with a lot of reservations, all of which have proven baseless. This is a really engaging story, and I think it will appeal to more than just history nerds. Read it through that first long flashback and see if you can resist getting hooked.