I might have missed someone else already saying this, but maybe the ultimate choice, even as a group, would be "Godzilla" and the series of other events including the big guy again and again. They really go from, at very best, bad movies, to really bad movies and then to a couple rather high tech, better, but still not great versions. But from best to worst, many people really love whichever one it is. To some people, as long as at some point railroad train or subway train cars get bitten and you see fireworks slide down a string from a toy plane at a guy in a rubber big reptile suit, or toy tank fire of the same type against some guy in a rubber big reptile suit ..... they love it, they wouldn't miss it for the world.
The movie has a large niche ... but many others have smaller ones. To the smaller groups, they see a whole new layer of so bad it's good.
A good percentage of guys that would watch The Three Stooges, if left totally alone to do so, likely watch at least one or two, likely more, of "The East Side Kids" (AKA "The Bowery Boys") flick. To many people, they just say Saturday Morning Movie. The very best of them was little better than the movie equivalence of brain surgery performed by chimps ..... but for much of their lives, while it might not be as often as it once was, now and then the time will be right and people will want to see two or three, or even the entire series under all names and forms, like "They Made Me A Criminal," with John Garfield, and the few as "The Dead End Kids." Bad flicks, all of them. But some people soak them in like a gigantic dry sponge .
Here's another example of so bad, it's good, but yet it has it's own close following. Any and all Basil Rathbone & Nigel Bruce "Sherlock Holmes" movie ever made. If they were played back to back, 24 hours a day .. a small percentage of the population would become mesmerized and powerless to do anything but keep watching them in whatever order they would be played in.
Some of those same people, along with a goodly number of others would be equally under the total spell of seeing nothing but "Charlie Chan" movies one after the other, even if in some "Charlie" was played by Sidney Toler and in others "Charlie" was Roland Winters. Start them running and a certain number of people become ... almost trace-like and nearly unreachable. Even if it's like the 219th time they've seen it, they find themselves glued to what is really a pretty low dollar very cheesy, a tad bit soft on acting and only mildly twisty, at best, plot .. it's moth to the flame time for that group.
To kind of handle a few here, in bulk, flicks like any Bela Legosi "Dracula" flick, or any LonChaneyJr. "Wolf Man" and you have a bunch of people totally happy with staying in on a weekend night ... they are just that special to them.
Boris Karloff "The Mummy" would be another one that would attract many of the same, and to maybe a lesser degrees, but still in numbers, any 'Mummy' movie made, Karloff and post-Karloff. Some were better received, but few were so bad that they wouldn't have a bunch of people sitting on their couches while holding bowls of popcorn and really enjoying a guy in rags, either high tech or low, try to take over and try to kill anyone who gets in their way.
Frankenstein ... as in the Doctor who created the monster. Boris Karloff was the best, but only a few attempts to update or refresh it, all that stunk really bad, pretty much every other in the "Frankenstein" series of flicks at least were not painful and most, mainly a favorite few of them, but some would draw big viewership, all bad enough to be good in the eyes of many.
To include more flat out comedy, almost all, if not all, Abbott and Costello movies ever made would hold a larger percentage of viewers than you might think. To stay more in tune with the last flicks, "Abbott & Costello Meet Frankenstein." Or "Abbott & Costello Meet The Mummy could be a good examples to make, but they all would hypnotize one out of so many viewers, and larger percentages than I bet most would think, and a bunch of people would love the heck out of some really terrible movies.
"The Creature from the Black Lagoon," come on now, you know more people would eat that up with a spoon, sequels and all, but never admit it to just about anyone other than people who knew because they watched them together.
There are a number of 'Cult Classics,' but some are dying out and 'newer oldies' are becoming the oldies.
A number others, in smaller numbers, did it with single flicks or with just one sequel, rather than bigger groups or longer series of them.
"The Amazing Colossal Man" always has it's own crowd that really enjoys seeing it now and then, even the worse sequel.
"The Blob" earned true cult status.
"Journey to the Center of the Earth" (OLD 1959 version) is like a jar of honey is to Whinnie the Pooh.
The 1960 version of "The Time Machine" has a small, but every bit as loyal following as the "Back to the Future" series. That's pretty good for a low quality production.
It could be accurately said about almost ever movie Clint Eastwood ever made. I don't care if he was playing the confused lab worker who lost count of his rats because one somehow, but comically, got into his lab coat, like in the sequel to "Creature from the Black Lagoon," to his; "are you ya' feeling lucky, punk, era to his spaghetti Western stuff to his "Every Which Way (fill in ending you prefer)" era, they were all pretty much, well, lacking .... but put a marathon of them on some weekend and a bunch of people will grin because they know they have will really enjoy their weekend.
"The Attack of the 50 Foot Woman" always glues a percentage of viewers to their sets. Not a massive number alone, but when you consider all these different viewers overlap flicks and genre among those mentioned, and others that would also fit, there are a whole lot of people who really love, 'it's so bad that it's good' viewing.
"The Day the Earth Stood Still," old black and white, a classic some people wouldn't miss for almost anything.
"Them." Giant ants from nuclear testing ... that one has a cult of it's own.
"Beginning of the End," another radioactive ants run amuck flick, but it's hard to pass up seeing some of the nicest mountains in Illinois, but you also get to see grasshoppers sliding off pictures of buildings in Chicago while Peter Graves fights and thinks his way to a solution. There's a group of you out there who wold never admit it, but when you saw this one mentioned you thought, ohhhh, that one, it's cool, I always like that one. Well, you're not alone. There are a bunch more just like you.
"The Giant Gila Monster" is another similar one. It has it's tight cult of followers, and some of them overlap into one to many of the other flick types/genres.
The entire TV series "The Cisco Kid." Bad at best. Run a marathon and you turn a percentage of the population into zombies.
Another that will do virtually the same thing to virtually the same crowd ..... "The Lone Ranger." Talk about a shitty predictable plot. Gee Tonto, I have a feeling something might be going on. Uhhmmm, kemo sabe, me go into town and listen around or sniff around strange camp. ..... Tonto gets the snot beaten out of himself, while putting up a tremendously heroic battle against eight guys, and the The Lone Ranger shoots the gun out of some guy's hand or plugs someone in the shoulder and the bad guys give up. The Lone Ranger is the hero, and Tonto is stitching up his own wounds and recovering from another concussion. You could set your Timex watch to that being the basic plot most of the time, and it was never done any better than the worst of tries ..... but run the series from first episode until last, back to back, and some people will not only get a copy for the future, they will sit up all through it drinking gallons-o-coffee and smoking sativas .. but they will want to get through it.
Similar, but to a smaller crowd. The TV series (1957-1959) "Zoro." It was the "Batman" of the earliest (set in time) Westerns. Campy, low budget, poor acting and stories that were more predictable than the tides. But they're in some people's DVD collection, but that's not enough for them, they watch them when they are aired on TV too.
An early Western TV show that also fits into the same group is; "Have Gun - Will Travel." As predictable as one could ever be, it still has a cult following who will watch, for about the 78th time, as if they don't know if Paladin really knows if the bad guy has snuck up on him or not. Maybe not the biggest draw of all time, but run it in a marathon with "The Rifleman" alternating one show after the other, and you just couch-bound as many people as indica.
While loved for different reasons, I bet that there are pretty much as many really bad flicks and TV series that some people LOVE as there are quality movies and TV shows that people love.
Sometimes bad is good, or even better.