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I'll share my opinion: in the 3rd installment, good design ideas were ruined by the low technical level at the time. When you look at the pikemen, you just feel sorry for them.
The 5th installment of Heroes is essentially the same as the 3rd, but made in the style of modern games. For some reason, the castles in the 5th installment don't surprise me. The units are predictable. There's a ranged unit, a melee unit, and a mage.
And about the graphics - overall, the graphics are decent. But again, it strongly resembles a modern RPG.