The germans, persians and internal disputes smashed the Romans in the end.
But the romans smashed Greece and Gaul and Carthage.
It is true the romans tried to copy greek warfare, but they changed their style because the formations were too rigid and were not suitable for the terrain and the enemy they were fighting against.
But Marian changed everything.

The greeks and the barbarians of gaul and germany were far from united, each at each other's throats. Then again, same for the roman politicians in the senate.
Actually, the romans did conquer germany but they lost control of it in AD9-11
There is a bad side to everyone. No faction is perfect.
Quare nequeo graeci consum amicus ut romani?
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