"Messengers..." - excellent units - in the mid-game - a source of easy experience, very effective in skilled hands.
Santa Gremlins - at the beginning of the game, they can be devastating, as one Santa deals as much damage as a dozen!
Werewolves - I generally hate them (although I'm very glad that such monsters appeared in the game) - I only attack them when I'm 100% sure they won't bite me even once (they've ruined my strategy many times with their bites and turning into themselves, for example, my upgraded Fairies) =))
I rarely recruit them into my army, except for Fire Elementals or Nightmares (but only when I have a good number of them), or Snipers (although I never recruit too many of them).
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