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Visually, they're acceptable. Although the phoenixes disappointed me. It's a bird of thunder, not a phoenix. There's not even any ash left after death. Horrible. And the rebirth is somehow buggy – it occupies a cell, and the phoenix won't be reborn. But the other abilities are powerful, especially the return ability; it's devastating, and the undead and humans can only cry about it.
The air units are good archers. I used them in the first mission of the Alliance campaign – they performed very well at the beginning.
The fire units are standard, although the explosion after death is nice.
The earth units have good potential as tanks and can disable a dangerous enemy unit for a while, or protect an allied unit. But summoning them makes sense only with a scroll; it's not worth investing in magic.
The water and sprite units have useful abilities, but the fact that they are a repeat is a huge drawback for the developers.
It's now easier to kill the wolves.
The mermaids are an unpleasant unit if you're not undead or a human with sprites.
The darkness element rules! Excellent abilities, good speed. Summoning these creatures is a must-have.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!