Michael Lopp –

Less than 1% of your writing will be life-changing.
3% will be trivial to write.
4% will strongly resonate with others in a way you didn’t expect.
5% will be quite good.
15% probably should’ve never been published.
26% will elicit a reaction you did not expect. Positive or negative.
28% will become vastly better because you chose to edit.
30% will start as one piece but finish as another.
40% will be good solid writing.
45% will do much worse than you expect when published.
60% of your writing will never be finished. Be ok with that.
100% of your writing is worth your time.