I confess I LIKED some of the art in the Museum of Bad Art link!
The problem with art, music, literature is, of course, that someone's trash is another's treasure. How do you define "bad"-that it doesn't follow the rules of how to draw, uses the "wrong" colors, or is just weird? Picasso was weird for his time, and obviously has many fans today.
Same with literature and music-what's cutting edge at one time was probably labeled bad, immoral, or both.
In the eye of the beholder, and all that