2 - Towns are dungeons are good, but they have some inconsistencies. 1 - Towns are dungeons are poorly designed. The outdoor sections are well-designed. 3 - There are no large, open meaningless spaces. Sections a logical consistency about them, i.e., deserts don't have lakes in them, etc.
All section have meaningful encounters that tie into or augment the story.
1 - Many of the sections have no real purpose, or many sections have inconsistencies. The sections have no real purpose, or the sections have major inconsistencies. 3 - All the encounters augment or add to the storyline. 2 - Most of the encounters augment or add to the storyline. 1 - Few of the encounters augment or add to the storyline.