It invites re-reading. Content is unified and generally coherent. Key ideas are supported with details. There are few grammatical and mechanical errors. Sentence patterns are sufficiently varied to keep reader interested.
Diction is generally concise, accurate, and appropriate to audience and purpose.
Content may be ineffectively organized, with weak or missing transitions. Diction is limited in range, occasionally marred by repetition, redundancy, imprecision. Sentences may be choppy, monotonous. D Suggests incompetence. Thesis may be unclear or missing.