Romans are bad in every aspect, they are too expansive, their horses use much more crop then others and if you want to bring crop usage to normal point you have to build their special building and that is so bad, their units production speed is 3 times slower then others and they use 2 times more resources to build. Only good thing they have is that they can build both resource fields and city buildings at the same time that can be countered by buying gold. Only real strength they have over the other tribes is their individually stronger troops that if you do not lose whole server and mass their numbers can be used to crush the WW with their fiery catapults. Thats it.
So in conclusion.
You want to go as attacker then go Teuton
You want to go as defender then go Gaul
You want to build more villages and pop then go Romans and risk to become farm.