Which Orc hero do you prefer?

You just need to use Warmongers correctly (to justify Tilsek, I hope this isn't off-topic?). Firstly, thanks to their abilities, it's not that easy to deprive Warmongers of their rage. Secondly, you can use abilities to encourage them, and they will move earlier than their initiative would normally allow. The same can be done by Chieftains, and Shamans can also speed them up. Thirdly, you yourself hint that at the beginning, they aren't the main focus; there are other Orcs that are more of a threat, for example, Goblins due to the Horde's rage, then Cyclops and Chieftains, and Wyverns as well. So, during this time, they accumulate so much rage that it's not that easy to reduce, and the hero also helps. In addition, you need to use the "Taunt" ability, i.e., move next to Goblins, for example, and Shamans. Let someone try to take the easy path and quickly defeat the Goblins! They'll get a mega-counterattack. In conclusion, in unskilled hands, Warmongers are indeed just cannon fodder. But in the hands of strong players, they are a terrible weapon.