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There are significant advantages and disadvantages to Roman troops. A Teuton's starting unit, the maceman, costs half as a much as a leigonnaire to train, and moves faster and can carry more resources. This allows them to build much larger armies much quicker, at least in the beginning of the server. However, a legionnaire is significantly better at attacking and defending than a maceman and while macemen will be absolutely destroyed by cavalry, legionnaires can stand up much better to raiding cavalry. This means that while you need to be more careful with your legionnaires, an army of them will be useful for more than just raiding, and for much longer.
This is the case with most Roman troops. Prateorians are expensive, but fantastic at defense, and imperians are some of the best attackers per wheat in the game, With the new horse watering pool, Equites Imperatoris and Equites Ceasaris are even more efficient and powerful than before. Your armies will be more expensive and slower than your Teuton and Gaul neighbors, but they will also be much more powerful.