The first picture looks like a modern Siamese cat or an Oriental Shorthair that is patently overbred even for a cat that is already overdone:
Above: I am not sure I would call this cat an ugly cat, actually. More a sad cat. Breeders like to breed large ears and an oriental style face (long). This fella has a very bony long face that looks artificial and the ears are horribly unnatural.
|Ugly cat or sick cat?|
The cat immediately above looks like a poorly bred orange tabby Exotic Shorthair with tear duct overflow and jaw misalignment. This is a cat that suffers because of irresponsible breeding and to call the cat ugly is unfair. Apparently deformities of the jaw or teeth are a hazard in breeding the Exotic Shorthair. I mention that on this page: Tabby and White Exotic Shorthair Cat. The picture below is another horrible mess of an attempt to breed a flat faced cat, probably the modern Persian. Madness. We don't see these failed attempts do we?
|Above: Badly bred Persian kitten|
|Ugly cat - yes I agree|
The last cat of this trio is genuinely ugly. This is a very peculiar looking cat. The picture looks genuine. There are elements of the face that indicates that this cat is meant to be a Sphynx or a Peterbald (with a brush coat). But who knows? This cat could just be one of those anomalies. The hair is very thin so it might be hairless on a seasonal basis. He appears to have been in a fight as he has a scar on the nose.