Field battles with AI seems to have improved quite a lot, but anything involving points or sieges is still dog shit, then again AI in sieges have always been pretty shit in TW games even when months of patching has occured.
Me and a friend was just fucking about so we did a battle, me and him defending vs 4 AI armies, they had a shit ton of towers and ladders but used none of them, they just used all their onagers to shoot at the walls, as soon as ONE whole appeared, the entire 4 armies all tried to pile into the gap, where we just grinded them down, leaving 3 of my heroic unit noble units with around 1000 kills each lol.
Even though his onagers continued to shoot holes in the wall, the AI stayed committed to trying to pile all 10,000 of his men through one little hole, this is one part of the AI I really hope they can improve. Not only did the AI set up all 4 armies on one side, rather than surrounding the city, but they basically handed us the win easily with their OMG ITS A HOLE CHAAARRRGGEEEE mentality.