Agreed. Any list longer than “the one ugliest car” that omits the Aztec isn’t convincing.
I was going to suggest my subtractions, and add replacements with witty comments, but there’s just too much work to do! Only about a half dozen, at most, of the cars on this list should be included. As you mentioned, the Pontiac Aztek plus the 1977 Datsun 200 SX, the 1971 Buick Riviera, the Citroen DS (introduced in 1955 but built till 1975), the 1969 Stutz Blackhawk (Superfly’s wet dream), the Lotus Elise, and the 1961 Plymouth Valiant all are way fuglier than most of the cars on this list.