dominus romae said:
Civ2 is better. The AI in Civ3 is just more stupid than the AI in Civ2, although the both are too stupid. Civ2 has a lot more strategies. For example, if you try the classic SOD strategy in Civ2, if one of your units gets wiped out, then all of your army is destroyed. Civ2 values troop maneuvering and the combat system is a lot better and realistic.
The AI in Civ2 is quite a bit stupider than the AI in Civ3. Some of it is game mechanics, though. One of the worst rules in Civ2 is the one you mention: stack death. Nothing is as unrealistic as seeing a huge army wiped out because a single unit loses. So in Civ2 you have to do unnatural things like separate all your units instead of concentrating your force. Then again, the AI does help you by building fortresses and then not manning them - really really dumb.
Civ2 combat is way too boring. Most battles don't need to be fought because the odds are so lopsided. Unfortunately, the AI has no clue about this and insists on attacking even when its odds of winning are vanishingly low. For offense, basically all you do in Civ2 is count up the defneders in a city. If there are X defenders, you bring X+1 fast attackers with higher attack. No surprises. No real strategy needed. In Civ3, you need a mixture of attackers, fast units, artillery and defenders.
In Civ3, you can just send lots of units in a stack and destroy your enemies easily. Also, you will need 5 swordsmen for each spearman the enemy has. This is not realistic.
These two statements contradict each other. Be aware that when you launch an attack into AI territory in Civ3, they will also send a large stack to go after your cities. Yes, you may succeed in sacking their cities but they will be doing the same to you. One of the more devasting things the AI does in Civ3 is attacking your rear. The AI likes to load up 2 or 3 ships and drop them off where your defense is thinnest.
Civ3 did away with silly zone of control rules that allow a single musketeer to prevent a huge stack of tanks from moving past. In Civ2 it was too easy to build an impenetrable Maginot Line. In Civ3 you have to occupy each square with strong defenders to block progress.
Civ3 also has luxury and strategic resources that the AI likes to pillage. The former will make your people unhappy while the latter prevents you from building the best units for reinforcements. This adds a new flavor to the game and gives you something to defend besides your cities.
On the whole, I find Civ3 combat far richer, more strategic and much more complex. Best of all it is more balanced: no more 30 shield spies bribing everything under the sun (award here for most unrealistic tactic), no howitzer kill-all super units, no infinite rail movement in AI land, no blocking the AI with old units, no more hiding under bombers, etc.