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Vampires are much weaker in Heroes of Might and Magic V than in previous installments. They don't deal as much damage. So, as strange as it sounds, they are not very effective in small and medium numbers. Only when there are a lot of them can they do something.
My observations:
- Jarl (or Earl?) causes the most destruction, as he attacks with lightning. Of course, this is effective if the enemy army is large.
- Liches deal excellent damage and have a cloud attack.
- Elves are excellent archers.
- Paladins have a charge attack.
- Archmages use Fireball.