I am finally having a challenging campaign of RTW. Admittedly it is with the Total Realism mod, but nevermind. I am playing the overly-weak Carthage on vh/vh and had quite a challenge. I should note however that this is due to playing with only the starting units plus town watch and skirmishers with mercs if available. This is primarily due to not being able to figure out how to build more advanced infantry (if someone can tell me how, please do) or cavalry (except elephants which I don't bother with). Also no computer faction will ally with me or EVER make peace once at war. Poor quality, but a challenge nontheless. The Marian reforms should make a Roman force powerful enough to stop me in the future, but for now it is a challenge. Its just a shame that the game proper cannot provide one.