In the early days of mass-market publishing. There were two kinds of books. The Novel and the penny dreadful. Guess which one sold the most. In the 20s, 30s, 40s and some of the 50s there were the pulps and there was "serious" literature. Guess which sold the most. From then on there have been hardbacks, paperbacks Trade paperbacks and special editions. Guess which ones sell the most. Today the lie has been blurred in a lot of cases between " literature" and "quick fiction". which has also blurred the lines between what is considered good and what is considered good. I started this thread as a bit of fun, but it has actually made me stop and think about my own conceits about what I think constitutes a good read, in the end it comes down to if I find it entertaining or not. If it engages me in some way ( ditto form films)or not. Is that the best criteria?