It holds the reader's attention. Relevant anecdotes and details enrich the central theme or storyline. Ideas are fresh and original. Relevant, telling, quality details give the reader important information that goes beyond the obvious or predictable and tells the reader something new. The writer develops the topic in an enlightening, purposeful way that makes a point or tells a story.
Every piece adds something to the whole.
Ideas are reasonably clear, though they may not be detailed, personalized, or expanded enough to show in-depth understanding or a strong sense of purpose. Support is attempted, but doesn't go far enough yet in fleshing out the main point or storyline. To extract meaning from the text, the reader must make inferences based on sketchy details. Information is very limited or unclear. The text may be repetitious, or may read like a collection of disconnected, random thoughts.