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Playing 3.0 after 1.6, I experienced deep disappointment. 3.0 is simplified to an absurd degree. I played through version 1.6 several times, and each time, fighting Nicholas was very difficult, but what an explosion of emotions you feel when you complete it. In 3.0, after destroying the nests, Nicholas could only put up 2,000 archers and a few other minor units against me, while in 1.6, I fought against 17,000 archers, 600 liches, and so on.
In the mission against Isabel in 1.6, she had 500 paladins; in 3.0, it's almost comical – only 20. I was playing as a hero. I don't remember about the AI.