I have been playing some single player tournements, in "normal" they are to easy because your team has better specs.
In Hard is dificult, because your team has worst specs, and your team AI demigods are allways dying, I saw Sedna (enemy) been attaced by Rook and UB, and she was able to kill both ....
My sugestion is make all AI Demigods have the same specs, that is all at the same level, just the "human" Demigod will have better or worst specs, depending on the case.