I meant to say that revenge is a good thing, and there's nothing bad about luck; in fact, it's the opposite. And isn't that a cheat? Or is tripling the Watchtower's power a great thing? Or even better, the Banshee's Scream? How is that? Does that count as an ultimate ability? Exactly...

You're saying that the Unicorn has much worse defense than the Djinn or the Nightmare?
And that the blue-clad, sword-wielding creatures also have poor defense? Or the Dragons? Do they have virtually no defense?
In general, for me, the only difficulty when playing as the light-aligned factions is the huge amount of wood required by their castle. That's it.