I forgot to give a detailed answer regarding Rage... The Rage enchantment is needed to gain Rage points faster... But it only works effectively with the Battle Frenzy skill (bonus is higher), and Rage Surge spells give more of these Rage points.
The fact that it loses more is not critical for the Orc; the main thing is to gain Rage quickly, not to lose it quickly. They can be knocked out of Rage, but with the Rage enchantment, even Paladins will gain a lot of Rage points plus 75 Battle Frenzy and Blood Memory, and a bunch of skulls from 150 to 200, meaning that without any super abilities, after an attack, a Paladin will have the second or even third level of Rage, and with an upgraded defense, how much will the unit that retaliated take? Even if it's a level 7 creature, I'm willing to bet it won't be more than 5% of the squad, while the Paladins will take down up to 50% (depending on the creature's defense).
Let's calculate: the highest attack is with the Orcs, plus Retribution (25% additional damage). How will the Paladin hit?
And this is just one Paladin... And I haven't even taken into account the bonuses from Rage levels.