Heh, this is exactly why I hoped that the army compositions could be externalized, much easier (and quicker) to test that way
For my part I'm not giving suggestions as to what the best composition is because I don't know what it is, I'm too new to the game to provide meaningful commentary on this issue. I was hoping that the Gandalfs and other vets would provide the army compositions that they find succesful in their games, and use that as a starting point...
Anyway, the issue is more complicated than just 'whats the best army composition' as you have to be able to take into consideration the factors in game that control that. The income, resources, gems, available mages (and magic for the '?' mages) are all controling factors in what the 'best' army compostion will be. Also certain balance or bug issues may be negatively impacting the AIs army compostions, issues with building forts and labs come foremost to mind.
So it may be too eary to start tweeking the AI, the balance and bugs need to be resolved first. But it's not too early to provide specifics as to what an ideal army compostion should be (scale it for turn#, or gem income, or whatever if you can). Once other issues have been sorted out, we'll be that much further along to getting a more robust AI (if it's needed that is

)
I'll try a specific if you like...
C'tis (non Tomb theme)
20% LI (for the javalins)
40% Falchioneers or Elite Warriors (or both)
20% Swamp Gaurds
10% Longdead + Skeletons
10% Other (poison slingers, Serpents, Dancers)
The other is somewhat based on effectiveness of blessing and availability of Undead to use with the slingers.
The % of SG should drop as more and better Undead become available. If gem income and mages allow the % of Falchioneers and EWs should drop to allow for more death/nature (ideally poison immune) summons. The % of Slingers can increase as more poison immune units are created.
Comanders...
One LK per army mininum. As the army fills out one Shaman and one Commander or Lord to help ferry units. Undead can be led by MMs or Sauromancers, or summoned (Banes or Mound kings early). Add more mages as they become available to summon more hoards of undead.
Well there you have a stab at some concrete numbers
