Orcs have no magic. Warcries.

defense won't help the Orc. The Orc should always strike the enemy unit first, so that there is no one left to retaliate. Moreover, it is not important when Rage is present, which absorbs a significant amount of damage. Therefore, it is necessary to rely on Rage, which gives them so many advantages.
"Protect us all" is a completely uninspiring ability. When there are a couple of hundred Orcs, Goblins don't play any role. Assassins do. And how. But not Goblins. Well, yes, one dead Angel. That's all. And even then, only if Howl is present. Otherwise, they are taken out in one or two casts of Meteor Shower, which is not even cast directly on them, but nearby, on other creatures.

Added 29 minutes later

You take them when you need all the 3rd-level Orcish warriors (they are rarely used in development anyway).

But here I don't understand much. Why aren't they used? And who is used instead? Goblins? And aren't Warmongers a combination of bulk and muscle?