I would also say 'Les Misérables' by Victor Hugo. It's extremely long - winded. Hugo goes into great detail about the history and the setting, which can make the actual plot progression seem slow. There are so many digressions that it can be hard to keep track of the main story.
Another one could be 'Gulliver's Travels'. While it has some interesting ideas, the constant repetition of Gulliver's adventures in different lands can get boring. After a while, it feels like the same pattern is being repeated over and over again.
In terms of readability, 'Les Misérables' by Victor Hugo can be a bit of a pain. It's extremely long, and Hugo often goes on long tangents about historical and social aspects. While these are important for the overall context, it can make the reading experience quite cumbersome for some.
Some people think that 'Dear John' by Nicholas Sparks also falls into the category of worst romance novels. The plot is rather melodramatic and the relationship between the characters seems forced at times. Another example could be some of the Harlequin - style novels from the past that had very formulaic plots and shallow characters.
There's also 'Novel Y' which had a really bad translation. The English version was full of grammar mistakes and the cultural references were completely lost in translation. This made it very difficult for non - native speakers of the original language to understand the story, and even native speakers found it hard to enjoy due to the clumsy translation.
I think 'The Mortal Instruments' series has some issues. The plot gets really convoluted as the series progresses. There are so many characters and sub - plots that it becomes hard to follow. And the world - building isn't as consistent as it could be.
Sure. 'The Golden Compass' movie is often regarded as one of the worst. The film made some significant changes to the source material, which made the story hard to follow for those familiar with the novel. It also failed to build a strong connection with the audience, despite having an interesting concept from the book.
Sure. 'Plan 9 from Outer Space' as a novel (based on the equally bad movie). It has a really silly premise and the writing doesn't do much to salvage it. There's no real depth to the alien invaders concept.
Well, 'Identity Crisis' is considered bad. It had some disturbing plot elements like the mind - rape of a character. This was a very dark and unethical plot point that many fans found unacceptable. It also had a negative impact on the way some characters were perceived in the DC universe.
Sure. 'The Boring Mystery Case' is a bad one. It fails to create any sort of mystery atmosphere. The clues are just randomly scattered and don't lead to a logical conclusion. The main character who is supposed to solve the mystery is not very likable either.
Some might say 'Moby - Dick' is a candidate. It has long passages about whaling that can be extremely dull. Herman Melville goes into such minute detail about the whaling industry that it can feel like you're reading a textbook rather than a novel. For those who are not interested in maritime adventures in such depth, it can be a tough read.
I'm not sure of specific titles always listed as the worst. But sometimes, books with inconsistent world - building end up in this category. If a world is supposed to be based on a certain set of rules for magic or society, and those rules keep changing randomly, it makes for a bad read. It's like building a house with a different blueprint every day.