Maybe I'm very biased, but in my opinion, this game, which I can barely call "Heroes," is the greatest failure in the series' history. This game isn't "Heroes"; it's some nauseating clone of Disciples with King's Bounty elements. In addition to this, the game has mediocre and overly pompous graphics, an inconvenient interface (improving troops in the recruitment window? really? what a brilliant idea!), a terribly presented, unclear, and frankly idiotic campaign; a poor tactical component (battles lasting an hour and a half, especially sieges, with the concept of who can heal better and the meager damage of units – it's so much fun), a ton of bugs, ruined magic, and generally, the entire concept of the series.
The only good things about it are the Nagas, the art, and the soundtrack.