I was inspired by this Youtube video:




Marvel Comics Toilet Paper,
Comic Tropes Crappy Comic Book Contest
https://www.youtube.com/watch?v=8fAtCfEncnw



I think we all can offer a few unsavory contenders. There are many criteria to determine "the crappiest". If one goes strictly on bad storytelling, it would just be too uninteresting to be worth the trouble to read and review.
I prefer selections that should be good stories, where the creators have the talent to do something better, but just do it badly, to the point of disappointing and insulting readers.



For me, the absolute worst comic I ever read was AMAZING SPIDERMAN 289. Where after literally years of buildup (starting with issue 238) and clues left across countless issues and other Spiderman titles, the identity of the Hobgoblin is revealed, and none of the clues match up with the character revealed!

The run where Roger Stern began the Hobgoblin storyline were fantastic, and still among my favorites, across 238-251. The Hobgoblin appearances in SPECTACULAR SPIDERMAN and other titles were also passably decent. Up till this particular issue.
As high above, so far below...