I base my experience on VH/VH games as Gondor, and I have noticed the AI plays unbelievably bad when the human player tries a sally.
The first problem starts because Mordor AI does never consider to attack when human tries to sally. It drops all its sieging weapons and retreats far away from the walls.
Since most of the time orc armies are composed solely from heavy infantry and seldom have any archers at all, the following tactic does wonders.
Place three units of archers at the walls and one by the gate. Place three units of cavarly close to the gate.
Sally with the archer unit by the gate, and try to lure them closer to the walls by harassing them with arrows. Usually Mordor AI will charge the archers with the a signle unit of heavy infantry, so the human player can run back inside the gate.
After taking heavy casualties from the archers on the walls, the AI will find the door closed and will be forced to retreat. At this point I pause my archers on the walls and charge from behind with my cavarly from three directions (front -which is their back as they retreat- and flanks). Doing this I have time to quickly inflict heavy casualties to the retreating unit, or even destroy it.
After the initial charge the cavarly retreats behind the gates, before orc hordes, which now come massively, get it.
I repeat (with a new unit of archers to keep them all as fresh as possible) till all my archers run out of arrows.
After returning all my inits inside and close the gates, I am allowed to escape. The sally is considered succesful and I can exit the battle. Using this tactic I often reach a 1:20 kill ratio.
My suggestion is either force AI in general to use its sieging weapons aggressively, or force Mordor AI to recruit more archers.
I have noticed when Mordor AI had archers, it used them wisely to counter my archers.





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