I felt the Romans were so overpowered that I modded Legionary Cavalry, Praetorian Cavalry, and Urban Cohorts out of my game
Yes, I felt a bit like that.

I'm modding and limiting recruitment of a Praetorian Cohort and Praetorian Cavalry to Italy, and an Urban Cohort to Carthage, Lugdunum, and Rome. 5th Level Barracks and Stables now give a +1 Exp to a Legionary Cohort and Legionary Cavalry.

Hopefully more historical, and better balanced IMHO