Heroes of Might & Magic III: Horn of the Abyss

I don't know, personally, the graphics of the third game are perfectly fine with me. In Heroes, the most important thing is strategy and atmosphere – not some particularly impressive graphics or effects.

Added 1 minute ago

And there are many fans of the original third game who play it not because of the graphics.
And there are many people whose computers can't handle super-high-quality graphics (like mine).
Are you suggesting making a 3D version of the third game? :D

You forgot to list
There are also many people – big fans of the graphics in Heroes 3.