5Q–Hard to imagine it being better written.
4Q–Better than most, marred by occasional lapses.
3Q–Readable, without serious defects.
2Q–Better editing or work by the author might have warranted a 3Q.
1Q–Hard to understand how it got published, except in relation to its P rating (and not even then sometimes).
5P–Everyone was dying to read it yesterday.
4P–Broad general or genre appeal.
3P–Will appeal with pushing.
2P–For the reader with a special interest in the subject.
1P–No one will read unless forced to for assignments.