Everybody likes anime with good animation, compelling storylines, and well developed characters. But only some anime fans - the hardened, grizzled ones who love things that are horrible - can apprecaite anime so bad they're good.
Terrible anime that are still fun to watch include the infamous Garzey's Wing, which sounds like any random isekai but is so poorly done that it's impossible to take seriously, and the equally well-known School Days, which takes the slice of life school anime formula and turns it into a nightmare. There's also Brother's Conflict, a show about a girl with thirteen stepbrothers and a talking squirrell who are all in love with her.
These shows are best watched in a group with a good sense of humor, though they can also be appreciated alone. Which ones do you love to hate?