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Yes, I already voted. But my opinion has changed since then; is that possible? :) Now, I think there are far fewer units that are cool and powerful. :)
Now, I consider the most powerful to be dwarves with magic resistance, wolves with double strike, ridiculously large centaurs, and among the archers, I like both the hobbit and the crossbowman. Both are very good for the first level. :) Berserkers are also quite strong, but they are as dumb as... well, as the AI in Heroes of Might and Magic 4 :D
Sometimes, when playing as Nature, I would summon leprechauns in the early stages for good luck. Fairies with retaliate and squires with stun can also be helpful. Orcs are more useful in melee combat, and rogues are more convenient for scouting. There are often 10,000 skeletons, or at least 5,000. And there is nothing more annoying to a mage than an imp, especially if that mage is an angel or a phoenix. So, all first-level units are not useless, but I have highlighted the most powerful ones above.