Saw "Yor" as part of a double header with "Blue Thunder". Yor was capable of cult status. I could still find some kind of redeaming value to it. Its always fun to laugh at cheesy special effects.
"Cool World" was pretty bad too, but once again, you could find a moment in it.
Never saw "North".
"Tank Girl" was not that bad... not even in the running for worst ever.
You guys are just failing to realize that this is not a subjective matter. If you don't believe me... watch the movie. I know you can't believe it is worse than the movies you are listing, but it is.
MiniD