Oh, believe me--Danzig was destined for #1. Worst comic I ever read, unquestionably. Worse than anything I ever encountered in a slush pile as an intern.
One of the Danzig comics was so bad that I, along with some friends attempted to drunkenly sacrifice it to a tree. The damn thing wouldn't burn, which is proof of of it's evil nature. It wound up nailed to a tree.
On topic, Robert Weinberg's Cable run was pretty damn poor, but not as bad as the Nightside comic that Marvel published. Apparently he was famous for other things, what exactly I don't know.
Well now, I think we all know this list would be incomplete without Jenna Jameson's Shadow Hunter. Virgin/Liquid comics gave us this gem - you know, the comic company spearheaded by Richard Branson and Deepak Chopra [whaaaat?!?]. It was well presented and some of the artwork was quite nice but the story was utter, derivative, bollocks.
Imagine a comic about a busty, leather-clad blonde, with a sword as written by Jenna Jameson... aaand you're pretty much there. In fact, it seemed even the creators couldn't be bothered finishing it. Not properly, anyway. Three quarters of the third, and final, bumper sized-issue was simply text telling the rest of the "story". As nicely typeset as it was poorly written.
And Turf was so bad I didn't even get to page 8 of #1.
If you're looking for a good example: try Lobo by Scott Ian from Anthrax. Jolly entertaining.
Now if someone was to turn the Fast Show's Ted and Ralph [see http://www.youtube.com/watch?v=DukZxJ4wS4A] into an Ennis-esque gunplay and sweary-bollocks-with-a-heart-of-gold comic series that would be dope.