They are underappreciated. Sometimes you need a medium or large print, but too often, a small contact print is nice too. Particularly where the composition/shapes are simple or minimal and you're not trying to do f64 style landscapes.
I make bookmarks with strips of MF negatives. On silver gelatin FB paper or cyanotypes, they are wonderful triptychs. 35mm makes nice bookmarks too.
I've got nice 4x5 contact prints as well, such as cyanotypes or toned cyanotypes. I generally don't frame such photos, but I could. They are nice in hand or on fridge.