Djadame
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Well, there's a general consensus that Heroes of Might and Magic IV isn't very good. Although, on the other hand, the majority is the majority.
In Heroes of Might and Magic V, the graphics are a bit cartoonish, which is disappointing. And as far as I remember, the Giants had yatagans.
But the main problem is: Heroes of Might and Magic V doesn't have Death Knights (they exist in Necropolis as neutral units)! How are you supposed to play?