I must admit that when I first released RS and this team began to grow, I had a very 'biased' views of the so-called 'Barbarians'. A lot of (not so reliable) information also leads one to believe they were uncivilized, had poor weapons, and basically were only a few degrees above the Neandrethals.
But the more we studied them.....dug for information...learned from sources other than those that are commonly 'easy' to find...the respect and admiration we began to have for them. My view of 'barbarians' is now nearly 180 degrees from what it was. They were smart, advanced in many ways, their metalworking was very good to excellent, their craftsmanship superb.
One problem with knowledge of them was that they were 'wood builders'...so little survived of what they built over centuries. Another...they tended to BE migratory, or, overrun by other migratory tribes and destroyed. This scatters archeological evidence all over Europe from the Steppes to North Africa, and from Briton to Egypt. Still another...centuries of Roman rule and assimilation. Obviously, it is the 'winners' whose technology survives best.
So I tend to disagree that the Barbarians were inferior fighters to the Romans or anyone else. In fact, in many ways, man to man, superior. They were physically bigger people, stronger from a much harder life, and they fought for their freedom, their lands, and their families. All rolled into one, this made them very mean enemies. It was, by and large, their 'tactics' that couldn't match the Roman military...ever. They adapted in terms of weapons and armor, but in the end it was just sheer 'numbers' than gave them the Western Empire.
This is reflected in the stats they have in RS1.5. Powerful attack, but poorer defense. You have to have 'something' to represent poorer tactics...so less defense, morale and a tendancy to be impetuous portray this. Personally, in playing this mod myself, I rather enjoy the ferocity of the Barbarians and would have it no other way.
