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yeah, in Heroes, they made the resistances the simplest. In Heroes 3, there's only resistance to fire, and you can hit with water and lightning as much as you want.
I don't know, maybe it would be better if there were more. For example, undead should be afraid of fire and magical attacks, but physical attacks should be weaker, especially ranged attacks. If spears are attributed to piercing weapons, then crushing damage should also be dangerous for skeletons, and spears for cavalry, etc. You can, of course, try that too, why not?
Oh well. Enough reminiscing about all the parts. I'm reading this thread, and I immediately want to play some part of the game. Either Heroes 4 or Heroes 2.