Combine an expired film with a fixed focus, fixed exposure camera and that's what you got.
The instamatics were mostly with a fixed speed of around 1/60th and an aperture of F11. That means if you try to shot under light conditions that aren't sunny or bright enough, the film will be underexposed.
Another thing, expired films loose sensibility and display colour shifts..
Fresh 110 film is being produced and it isn't that expensive to get from places like the Film Photography Project.