A bad book is as much of a labor to write as a good one, it comes as sincerely from the author's soul.
Writers take heart, your hard work does not go unrecognized. I hope that all of my books are considered "good" and worthy of the hard work that I put into them.
Isn't that what you want as well?
Would we still be applauded for our efforts if we worked hard and, God forbid, produced a "bad" book? Or, would someone look at a "bad" book and say, "if you only worked harder you could have made it a good book."
Does working harder make your book better?
Who's to measure how hard a writer works on a book? The editor? The reviewer? Maybe. I think it would be the reader. I know, some of you are saying, "no wait, the writer should be the one to measure his/her own work."
Maybe you're right. But, don't we all, deep down inside, want our work to be read by others. Don't we wait, impatiently to hear from those readers how the story made them feel? What were their reactions? Did they like it? Hate it? Don't we then leave it up to the reader to tell us if we've written a good book or not?
Who holds your measuring stick?