They destroy any stack of any standard dueling hero with a single hit.
We cast antimagic on them, and the enemy frantically tries to shoot them down, but these aren't stupid zombies, where that works; these are peasants (hehe). It's all in vain.
I want to say that the strength of the units themselves shouldn't be compared to the strength of the hero.
Yes, gremlins are good because they shoot and are skilled in technology, but attributing their strength to their mini-arts is incorrect.
In my opinion, the best level 1 unit at the beginning of the game is the dryad, and in the final battles, skeleton warriors.