My least favorite faction is the Dark Elves. It's very difficult to play against them, and almost impossible to play as them.
Posts from The most UNPOPULAR faction in Heroes 5.
The most UNPOPULAR race

Клан "Вершители Асхана" - "Masters of Ashan"
But there are many of them.
Necropolis is the best! You can breed thousands of skeletal archers (this is about the version before patch 1.5; later they came up with this stupid "dark energy" system). Ghosts can really mess up the enemy's nerves (and army) because they have a 50% chance to miss. Vampires (!) regenerate, and their stats are pretty good. Liches shoot and can cast some nasty spells on the enemy (although they are average wizards). And the other units are generally not bad (only the dragons have weak stats...).
But in general, I like everything about the game, especially the factions and neutral creatures.
Why did the Cyclops forget how to throw stones?
Besides, they have become ugly and grown hooves!
The only flying units the Barbarians ever had were THUNDERBIRDS!
Who had the crazy idea to replace them with Wyverns, which absolutely don't fit this race?
Why didn't they remove the standard one for the Dwarves then?
Bow down and hear our cry,
Our earthly rulers falter,
Our people drift and die,
The walls of gold entomb us,
The swords of scorn divide,
Take not thy thunder from us,
Take away our pride.
G.K. Chesterton: English Hymnal

