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There aren't any creatures I dislike based on their stats, as I can defeat them all, but there are some I dislike based on their appearance. Here are a few:
For Necromancers, only the dragon is unappealing, while the rest look good, especially the Lich.
I like all the creatures of the Inferno faction, especially the Demoness.
For the Elves, I don't like the Hydras. They seem boring... But I really like their Witches.
For the Elven Lords, I don't like the Ents. They are too weak for what is supposed to be one of the strongest creatures of the Elves. I do like the Unicorns.
For the Empire, I don't like the Griffon, the Arbalester, and the Elite Guard. Their faces look like they were put together from different pieces, but I do like the Archangels.
For the Wizards, I don't like the Gargoyles. They are slow and boring. I do like the Titans.
For the Dwarves, I don't like almost all of them: levels 1, 2, 4, and 5. I only like the Thane and the Earth Elemental/Earth Elemental.
For the Orcs, I don't like the Goblins, who are always cowards, and the Free Cyclops when they attack their own. I do like the Chieftains and the Executioners.