Warcraft 3 Editor is the best map editor I’ve ever seen for a videogame in terms of simplicity vs possibilities. I think SC2’s editor is even more powerful, but it is also much tougher to use. It helps a lot that warcraft 3 had so much content (with the so many varied creeps and races) and a hero system integrated with the basic rules, thus the editor feels like it has more to offer from the get-go.