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Perhaps I am very biased, but in my opinion, this game, which I can barely call "Heroes," is the greatest failure in the history of the series. This game is not "Heroes," but some nauseating clone of Disciples with King's Bounty. 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 repulsive, 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 – that's so much fun), a ton of bugs, and a ruined magic system, and generally the entire concept of the series.
The only good things about it are the Nagas, the art, and the soundtrack.
There is absolutely nothing from Disciples in the game. It's HoMM 4 that took features from Disciples.
A pompous HoMM should have pompous graphics.
Half-hour battles? So slow.... either change your Castle.
P.S. Maybe you installed HoMM 4?!
How was the magic ruined? Now you can normally create your own magic book