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Simply: because the AI tries so hard on the campaign map. It cheats, it tries to outmanoeuvre player (and other AIs), it builds armies with terrible composition, just to be able to spam its enemies ASAP with whatever it has. In the same time, it doesnt pay any attention to distributing skills, developing its cities and, as mentioned, reasonable compositions. It just seems that somewhere during the development a terrible, terrible decision has been made how to develop the AI. I can imagine that the idea was to provide "challenge" but ironically, the AI is predictable and instead of being difficult to best, its just annoying. What is more, its strategies just encourage casual players to cheese via doomstacking and whatnot. A terrible, terrible design. I think it would be much better to make the AI more relaxed and thoughtful. Instead of pushing ahead 24/7, just make is stop, rearrange its armies, maybe not build three stacks with the cheapest units but turtle for a while, wait few more turns for a building to finish and make some more thematic and solid army. Make it willing to have a moment if weakness. If the player will want to take advantage of it, then why not, who cares. Me, I would rather give the AI some space just to test my new artifact/spells/army composition on an army that makes any sense. In the end, Warhammer is all about battles, not cheesing the AI on the campaign map. The campaign AI should serve as something like an engine to generate interesting and challenging battles, not a simulation of global politics via erratic movements and decisions (Warhammer never aspired to that and there are already much better games for that: Europa Universalis, Crusader Kings and other Paradox games). I adore the Warhammer setting so much, the battles look so cool, the mechanics is so nice, models, spells, even the simplistic campaign is cute but oh my, the gameplay itself is idiotic, irritating and preventing the game's true potential for epic confrontations. And I am so tired of this game, even though I love it so much. I would like to suggest putting the CA's office under siege until they introduce reasonable campaign AI. Are you with me?