Orcs have no magic. Warcries.

I especially like the "Wrath of the Horde" ability – it's very helpful with a large army.

That's the point, it's very helpful with a large army... But with a small army, it's almost useless...
That's why it's almost useless in online games... But if you're playing at home, in the late game, then of course, YES!!!

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I think that replacing magic with this ability results in a rapid increase in attack.

I don't quite understand the meaning of your post...
Do you mean that you don't level up spells and knowledge, but instead focus on attack and defense? Is that what you mean?