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I find the following units to be useless: Leprechauns, Satyrs, some elementals, Trolls, Mummies, Troglodytes, and so on. It's clear that you can't build a strong army with them alone, which is why I don't particularly like them. I consider the following to be the most useless: Pirates, as they are difficult to access and a weak unit; and Sea Serpent, when you already have a strong army, and you were given a couple of them for completing a quest. In my opinion, they are not very useful, just like, for example, 1 Mega Dragon, when you already have a large army.