Well, that is only part of it; there were usually a lot more romans and roman legionaires were trained to not head hunt; meaning they put up a wall of sheilds and stabbed for the lower torso; very effective; Celts had to try to chop through the heavy sheilds and ended up getting disemboweled; it was only when you could break the Roman's unit cohesion and interlocked sheild wall that any individual fighting prowess could be accounted for.
^
Roman battlefield tactics certianly took them a long way, but don't forget that the Legionaire would have at least two of the those nasty pilium spears, and a Gladius, not to mention some armor and that tower shield. Still, it could be an interesting match up.
Celts invented chain mail, had a head in height over them, and a big ass sword.
Legionaires won because they fought better as a tactical unit. The celts placed too much value on single combat, which ended up being their downfall.
I would have though some other matchups would be interesting; like:
Mongol warrior vs Commanche or Apache; both horse warriors of renown.
No need for muskateer vs samuraii; the French sword style won in real life over and over so much so the Japanese swordsmen changed their fighting style to begin using their short sword for combat.
I have only caught a couple shows; cant say that even with all my history that I can think up an interesting matchup that I would want to see. Fighting styles and equipment fit the era; in mana a mano fighting; pretty much if your side had more dudes and could surround the other guy before he surrounded you; you won.
