The thing that made the legions great was that all of them were trained to an equally high standard. In the other factions you have usually had alot of levy units with poor quality equipment and then you had the elites who were highly well trained and good fighters but there were few of them at best. The legions were not elites and yet were not levies. The thing that made the Roman's fighting style superior to the barbarians like say the gauls was that the Romans all fought as if ONE, while the barbarians just threw themselves at the Roman shield wall due to their individual fighting style, for the barbarians there was no plan B, they would either have to break the shield wall or flee.
Yes many of the Roman's equipment is originally from other cultures like Celtic, but the Romans then took the design, improved it, changed it, and perfected it into their own needs, created something uniquely Roman.
Yes, the Romans lost many battles, but then they learned from their mistakes and eventually defeated their enemies a.k.a-adaptablility, a trait very useful for an army.
And yes the Parthians and Germans defeated Rome a few times in battle. But Parthia didn't sack Rome like Rome sacked the Parthian capital multiple times. and the only famous battle of Germans defeating Romans is Tetuburg, (granted their were more) but do you know how many Germanic armies the Romans defeated?
Finally, in the end Rome did conquer most of the factions in Europa Barbarorum and this should say how unstoppable the Roman army truly was.
-Pontius Pilate
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