The most UNPOPULAR faction in Heroes 5.

In my opinion, the Dwarves in Heroes of Might and Magic V are the most original and interesting race, after the Sylvan.

Hmm, could you explain why the Sylvan are more original than the Dwarves? Or the Dungeon? Or the Inferno? Or anyone else, for that matter. Each race is unique and original; it's just that some people prefer the Sylvan, while others prefer the Dungeon. But that doesn't make one race more original than another.