If this goes on, what's the difference between it and a third-rate novel?

As a fan of online literature, I can't give a specific and accurate answer. This question required more specific background and context information to answer. But I can tell you that the difference between this and a third-rate novel depends on the situation. If it was referring to the quality or level of the novel, then if it continued like this, it might be a relatively ordinary novel because it did not reach enough depth and uniqueness to make a deep impression on the readers. If he was referring to the plot or development of the novel, then if it continued like this, it might be more mediocre, lacking creativity and surprise, unable to arouse the interest of the readers. If he was referring to the author or creative team of the novel, then if this continued, it might not be a good work because they might lack enough experience or talent to create a unique and charming work. In short, if this continued, the difference between a third-rate novel and a third-rate novel might depend on a variety of factors that needed to be analyzed in detail.