Ran custom siege to test (since I cannot replicate the conditions for the AI to actually attack my walled cities yet). Started out promising with the AI bringing it's ladders against the walls, and a ram against the nearby gate. Otherwise known as step #1 in any other TW game before warscape when attacking a walled city without catapults. So while nice, this is no big feat.
The ram made it to the gate but then did nothing. The men seemed to abandon it when they took too much fire and then just sat there until they were routed. The ladders both made it to the walls but one burned down and the men never made it up. Of the other ladder, the first few up top were all killed and then the rest of the unit stayed below for about 4 minutes.
At least once during this time they threw their pila at the walls, somehow able to see the units behind and think they could attack. You see the same nonsensical crap happening with javelin and bow units -- who can actually throw/fire high enough to hit their targets regardless of the fact that they can't possibly see them.
Line of sight anyone?
After this delay, the rest of the unit climbed the ladder and .....
...apart from 4 brave men, the rest bugged out at the top and never tried to jump down onto the actual wall. They were all shot to pieces and the unit routed.
This whole time the rest of the army -- we had a whopping 3 enemy units engaged so far -- just sat back by their scorpion with their siege towers. But ss soon as the ladder morons routed the siege towers sprung into action!
And.... one went in circles while the other two went the wrong way, away from the city, then they all spun in circles... FOR 20 MINUTES.
I exited to windows.