_troop3r
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The AI in Heroes 6 is practically no different in strength from Heroes 3, and it only becomes so strong due to teleportation. Because of this, its army doesn't spread out across 18 heroes. Otherwise, there's nothing complicated about it; on large maps, the game boils down to "luring the AI to a castle," otherwise it's difficult.
Moreover, the AI doesn't really take any risks here. For example, if your army is weaker than the AI's, and you might be able to defeat it in a castle, but you'll lose a lot of units and the other AIs will start bothering you. Instead, you lure it to a castle, and the AI calmly runs away to gather resources. As a result, the army hardly suffers any losses, and the bot dies after 7 turns. You can only fight the bot 1-2 times per game, and sometimes you don't fight at all. In my opinion, this is the biggest drawback of Heroes 6; in Heroes 3, the AI would immediately try to retake a castle even if its army was slightly weaker, but not here.