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Why is it that the fourths came right away with a great editor...
Let's be honest, the interface is weak; nothing is clear, and you can't make heads or tails of anything at first. Later, of course, you get used to it =) But I just can't bring myself to call it "great." I tried working in the editors for both part 3 and part 4. I liked the one for 3 much more, because it is simply easier =) Perhaps that's a relative opinion. Well, that's why it's MY opinion :)
And as for 5, working with the editor will probably be even harder. I hope they remove the inconvenient interface =( By the way, you are right — an editor is not just important, but essential. Without it, Heroes are no longer Heroes =)
I mean, the random map generator.
Now that will probably take a lot of time in five... If, of course, the random is as random as it was in 3 ;)