Maybe it is if you want to end it as fast as possible.
The roman campaign is the second one I played till 14 AD (fulfilling the victory conditions) and I had to face the yellow death, it happened that I had to fight something like 3-4 major battles in a sigle turn for three times, but it wasn't anything special. I was facing also several Agema phalanxes...
But as I said I don't feel like there are hard ones and easy ones, everyone is unique...