Originally Posted by Simon Appleton
I like a lot of the stuff that's already been mentioned - especially the cavalry charge (starts drooling over a MTW where the knights could do what RTWs general's units can); the sieges; and the variety of army styles (legion, phalanx, horse archer etc).
I also really like the senate missions - they give a direction to an otherwise rather intimatingly long and free-form game. I miss them when playing non-Romans.
I've taken a shine to the chariots - the careening, smashing into your line, circling around, their speed, their sheer destructiveness. They may not have been like that historically, but if not, they ought to have been!