Sadly, I do agree. Post-Marian reforms, the Roman units are almost unstoppable. R:TW certainly is quite imbalanced in this regard, much worse than all other TW games, and in many others.

It seems as if the Romans are engineered to rule the world, as they almost did historically, but they did not conquer lands as quickly as R:TW portrays - R:TW shows them having their empire at it's largest extent by about 100BC when really it was at this point by two hundered years later.