Sources

See a list I don't already have? Feel free to send the ranking/ballot/list to comicbookcanon@gmail.com and I'll work it into the ranking. 

Hobby Lark (The 5 Worst Comic Book Series Ever: Terrible Comic Books)
Screen Crush (The Worst Marvel Comics Ever)
Comic Vine (Worst comics of all time)
CBR (The 10 Most Disliked DC Comics Of All Time, Ranked)
Ranker (The Most Hated Marvel Comic Arcs Of All Time)
CBR (The 10 Most Disliked Marvel Comics Of All Time, Ranked)
r/comicbooks (What is the worst comic book of all time?)
GameFAQs (What are the worst comic books stories/graphic novels of all time?)
Comics Alliance (The 15 Worst Comics of the Decade)
That Guy With The Glasses (Top 15 Worst Comics I've Reviewed)
List Challenge (The Worst Comics Ever Published)
Mark Perigard (The WORST Comic Book Ever Published)
TV Tropes (Horrible Comic Books)
Geekery with Dante D (Top 20 Worst Comic Books)
Dork Forty (The Worst Comic I’ve Read in a While)
IGN (The Worst Comic Book Events)
Ranker (The Most Hated DC Comic Arcs Of All Time)
DC Universe (The Worst DC Comic Ever Published)
Sci Fi Pulse (Best and Worst Comic Books of All-Time)
What Culture (10 Comic Book Story Arcs EVERYONE Hated)
Mystichell (The 5 Worst Comic Book Series Ever: Terrible Comic Books)
No Flying No Tights (The List: Best/Worst Graphic Novels and Manga for Grown-ups)
The Genre Fiend (The Best and Worst 5 Graphic Novels of 2013)
r/graphicnovels (What's the worst graphic novel at all times?)
Sopitas (Los peores cómics que han existido en la historia)
Hobby Consolas (Los 5 peores cómics que he leído en toda mi vida)
Univision (Los 5 peores cómics del 2013)
Brain Stompimg (Top5 de los peores cómics de 2010 según Brainstomping.)
Univision (Los 5 peores eventos en la historia de DC Comics)
r/Comicbooks (What is the worst comic book or graphic novel you’ve ever read?)
Screen Rant (There Are Some DC Comics You Should Avoid, But These 8 Are the Worst)