Medieval II: Total War

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The AI isn't that bad, it just isn't that fast on the uptake. It takes time to respond to sudden changes, such as a massive Knights Templar charge on the flank. It's also a bit cowardly at times, like having a massive army outnumbering the player, but not even closing the range(even when they are the attackers...). In the campaign, the AI can at times be irrational, like agreeing to preposterous alliances and declining benefitial ones.