Errors in sentence structure are frequent enough to represent a major distraction to the reader. Word Choice Word choice is unique and uniformly excellent. Word choice is generally good. The writer goes beyond the generic word to find one more precise and effective. The word choice is merely adequate, but the range of words is limited, tending toward general, abstract terms.
Words are very ordinary.
The writing is free of errors. The writing is free of errors, except for a few extremely technical rules. The writing has some errors. The reader notes them but is not distracted by them. Errors distract the reader and may even obscure the meaning.