The DS is usually considered as the most beautiful one, not the ugliest one

There are not many car that I find ugly, but I'd list these:
- Fiat Multipla, the one of the 90s
- Ssangyong Actyon (and the Rexton & Rodius)
- Subaru B9 Tribeca (before the restyling)
- Plymouth Prowler
- Nissan Micra, the current one
- Ford Scorpio mk2
- Lancia Thesis

Right now, I do not find other regular-production cars...

I hesitate to put the Mercedes W221 as It is not _so_ ugly.
There may be many old ones that I do not think to.

There was a time I would have listed the Ferrari Enzo, but I think that I am used to it, it seems me less ugly than before.

I did not include concept cars, though that there are many that I find ugly.