Supreme
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You didn't say that, you said that runes are the only thing that helps them; it's just one of their advantages, like the fact that magic doesn't affect the Castle. I just argued that they aren't weak, but rather quite strong and decent armies of Dwarves. Just don't elevate your favorites by putting down other worthy opponents; look for the positive aspects of your point of view!!!
ALUKARD
If the question is specifically about warriors, then it's best to just test it. Take two heroes with equal characteristics, without skills or spells, preferably from an allied but not native faction (this is fairer for neutral units, if they are involved in the discussion). And just have them fight; if the victory isn't clear-cut, then they are roughly equal. :)
But if you take into account abilities, or growth, or special combat conditions, then you could say that a Gremlin with a cart can defeat a Phoenix or a Castle. (Imagine a map where in the corner, on a 2x2 tile, there is an obstacle, on a 1x1 tile there is a Gremlin, and there are also several other obstacles in front of the cart, and the Castle simply can't attack anyone...)
