Worst in the past ten or fifteen years is attainable. Worst of all time puts it in some rarified (putrified) air. I remember WCW PPVs from the late 80s and early 90s that would be real hard to beat. Off the top of my head, witness Halloween Havoc '89:
Tom Zenk defeated Mike Rotunda (13:23)
The Samoan Swat Team (Samu, Fatu and The Samoan Savage) defeated The Midnight Express (Bobby Eaton and Stan Lane) and Steve Williams (with Jim Cornette) (18:23)
Tommy Rich defeated The Cuban Assassin (8:29)
The Freebirds (Jimmy Garvin and Michael Hayes) defeated The Dynamic Dudes (Shane Douglas and Johnny Ace) (with Jim Cornette) to retain the NWA World Tag Team Championship (11:28)
Doom (Ron Simmons and Butch Reed) (with Woman) defeated The Steiner Brothers (Rick and Scott) (15:32)
Lex Luger defeated Brian Pillman to retain the NWA United States Championship (16:49)
The Road Warriors (Hawk and Animal) (with Paul Ellering) defeated The Skyscrapers (Sid Vicious and Dan Spivey) (with Teddy Long) by disqualification (11:39)
Ric Flair and Sting (with Ole Anderson) defeated The Great Muta and Terry Funk (with Gary Hart) (with Bruno Sammartino as special guest referee) in a Thunderdome match (23:46)
Flair and Sting won when Hart threw in the towel for his team.
A main event with Sting, Flair, Muta, and Funk couldn't possibly be bad, right? Go look up that match if you don't remember. B-ru-tal. Even the matches that look good on paper were not good in actuality. And then there's the fiasco that was Havoc '91 and the "Chamber of Horrors" match.
Oh, they were bad. But as a kid I convinced my parents to buy every horrible one of them our cable company offered.
Then there's this: UWF Beach Brawl. Check out this crap:
en.wikipedia.org/wiki/Universal_Wrestling_Federation_%28Herb_Abrams%29#Beach_Brawl Yeah, that happened. People crap on Heroes of Wrestling because they didn't know about Abrams' UWF.
And just to give you some insight into the greatest promoter that ever lived, follow along to Abrams' wiki page.
"Abrams founded the Universal Wrestling Federation in 1990 and remained CEO of the company until his death. He was the head booker of the UWF from 1990 to 1992, and again in 1994.
Before his death, while high on cocaine, Abrams was found nude, destroying furniture with a baseball bat[1] in his New York office,[2] while covered in a "vaseline" type substance.[1] He was in the company of prostitutes at the time.[2] Not long afterwards, he died while in police custody,[1] of a heart attack.[2] He had cocaine stuck all over his body when he died[2]."
You want to know who would book something like Beach Brawl? That guy. The same guy who once held a press conference to announce to a horribly confused wrestling press that he had signed Bruiser Brody....well after Brody's demise, of course.