Akka - Please read more carefully, I wrote that medieval societies, including the Vikings, was ruled by military aristocracies.
And yes, the vikings were warriors. But not only that. Most of the people were in fact farmers, merchants, craftsmen. Their societies had more democracy, justice and equality for more people than ancient Greece (also a society that highly praised warriors and courage) or the feudal Christian Europe. Contrary to the last mentioned there was also religious fredom.
If you really think that they were just considered of swordswinging savages, I strongly recommend you to learn a bit more about the subject. Just consider their abilities in shipbuilding, consider the literature, the craftship and the political organization.
You still seem to be under the impression that they were aggressors against a peaceful, innocent, cultivated Europe. As I already wrote, the Vikings raids were responses to agression. Please read a bit about how Charlemagne could treat his enemies. Or the fate of the Merovinges. Of course the Vikings were spoilers refusing to end up the same way and to beat their enemies in their own game...
About Valhall, pagan religions usually idealized warriors. But do you know what Valhall really was? A training camp for Ragnarok. And the post-Ragnarok world is not a bad place.
What is worse with a berserk than any other warrior-type I don't know. A medieval knight harassing downthrodden serfs is not all that appetizing to me.
The question is not if they were militaristic, because civilizations were that at the time, but if they should be militaristic in civ3. For me there are better candidates, for instance Greece, France or "America"(read USA)