If I have one complaint so far, it's the AI's willingness to break up its own forces on the map. I've seen this happen in almost every scenario so far. As soon as the next turn button is clicked, I'll never fail to see small raider-sized units moving, fighting, and besieging all over the place. As has been discussed before, ancient armies usually used concentration of force during campaigns, not guerrilla tactics. It might make sense once in a while to see a force break up in the face of an unstoppable larger enemy, but to see Pompey roaming around in Gaul with only a couple of auxiliaries... that doesn't make sense. In fact only once, during the 4 emperors scenario, did I see a single larger army under Vitellius marching towards one of my cities and attack.
This has been an issue with AGEOD games in the past. I remember seeing lots of discussions in the AACW forum way back about the endless tiny cavalry raids the AI would initiate against the player, but in ancient warfare it just seems silly to be chasing around dozens of small units with one or two large armies. The AI seems obsessed with taking lots of individual cities rather than win at battles and beating the player's army.
Anyone else notice this? During campaigns I'm looking for decisive victories, not chasing around a bunch of understrength enemy legions who refuse to give battle. It's like once a scenario begins, the AI just scatters its units to the wind, looking for opportunities to raid my supply lines and cause headaches. While this might make sense tactically, strategically it's suicide... not to mention just foolish considering the ancient world's sluggish devotion to honor and battlefield glory.
Again, just a small complaint. Perhaps there's an AI setting that I have checked wrong or something. Just seems odd that the AI would be that dedicated to avoiding battle and using hit and run tactics rather than stopping to offer a fight.