It seems that often even Dracula is viewed as a "good bad book". Not high quality literature, but great to read. I realise I've used vague terms in that senten

It seems that often even Dracula is viewed as a "good bad book". Not high quality literature, but great to read. I realise I've used vague terms in that sentence, even setting aside the tricky question of what makes the things often described as great works "greater" than things that are looked down on, but might be much more popular. I once read a great foreword to a novel lamenting the loss of "good bad books", citing Dracula as an example. It was by a famous author (as I remember), but I can't remember, and can't find, the foreword or the novel I'm thinking of.