Not really the AI often screws himself by declaring war early on a person with on 3 persons the same time and investing all his production on warrior units
As result this AI gets wiped out... Sorry but those early rushes don't really help i've never seen a AI succeeded in it...
If the AI plans his atacks better and not just dows someone because he has a higher military he can do a lot more damage or if he lose a war he would still be in a good shape...It should pick 1 war target and allways make sure he fights 1 war if possible... Will make a better AI...
THe AI olso fights war with people who aren't that close at all and it usaly takes more then 10 turns when the AI units arive at the enemy... Pretty stupid if you ask me it seems more effective if the AI just search close targets...
I often see a warmonger atacking me with some spearman early on and then get dogpiled by 3 AI's and get wiped out.
Imagine napoleon only dowing you because you are the closest and not other AI's because(he has higher military) it would be a tougher war...