I don't know if it's the worst, but I tried to read
From Hell but it got too complicated. I mean, I finished reading it, I even finished reading the extra stories and the notes at the end, but I didn't get much out of it. It felt like there was too much unnecessary info that didn't add much to the story or the mystery (much less give any answers). It's one of those times that made me wish Moore would know when to stop thinking and writing.
From Hell is incredible if you can get through it. great art by Eddie Campbell, as well.
https://viewcomiconline.com/from-hell-master-edition-issue-1/I think I would have enjoyed it more if I'd waited to buy it in collected form, rather than the serialized issues from 1991-1998. I thought the story was well told, and clearly well researched (with extensive footnotes by Alan Moore), but it just didn't engage me overly much. The Eddie Campbell art didn't do a whole lot for me.
But in a quiet, naturalist fiction way, and in parts a horrific way, it was a good story, just not one of my favorites. I read a good chunk of it in serialized form. But when the collected edition finally came out, I wasn't that enthusiastic about reading the whole thing.
I've always planned to purchase the collected edition and finish the story, but in over 22 years, I just could never work up the enthusiasm to pick the full book up and read it, based on what I've read in the serialized issues.
I above linked the colorized "master edition" version, broken into 10 parts, to allow reading a very long story (600 pages) in bite-size chunks.
But if you prefer, there are multiple other editions :
https://viewcomiconline.com/search/?key=from+hell