The following list was carefully curated by my brother-in-law, who says "it is definitive and may not be questioned".
Geo Tracker
The reliability of a Ford Pinto combined with the styling beauty of a Jeep's miscarriage. The Tracker was guaranteed to last well over 20,000 miles of wear-and-tear, at least according to the salesguy.
AMC Pacer
Its designers were apparently envisioning a rolling aquarium, which explains its massive glass posterior. Had it not appeared in Wayne's World, most Americans would have never seen one, except decades ago on the side of the road.
Subaru Tribeca
Shockingly, naming an SUV after a plot of land in Manhattan turned out not to be one of the best business decisions ever. Its grille looked exactly like Lena Dunham's posterior after a waffle iron had been applied for 10 minutes.
AMC Gremlin
More Troll than Gremlin, this two-door station wagon had all the curb appeal of roadkill. Its delightful failure in the market played a central role in the death of its maker, AMC.
2000 Subaru Impreza
The automotive equivalent of a lime green tuxedo, the Unimpreza was -- perhaps -- the biggest buzzkill for females in the history of cars. That is, if an Impreza really was a car.
2012 Jeep Cherokee
The 2012 Cherokee's grille boldly spoke out: “My designer was smokin’ something!"
AMC Matador
The Matador was apparently designed to fulfill the need of buyers seeking a family-sized Chevy Vega. Combining the reliability of a Soviet Volga with the styling of a half-finished Dodge Challenger, the Matador had it all. If by "all" you mean "all the tools to destroy an auto maker".
Pontiac Aztek
Its costarring role in Breaking Bad saved it from permanent ignominy. This unique SUV-Crossover-Station Wagon looks like Darth Vader's stroller.
Nissan Cube
If someone tried to place a Cube in a sci-fi move, they'd get laughed off the set. It was a sixties view of a 2000 commuter car if said sixties commentator was Timothy Leary.
Pontiac Trans Sport
You didn't see many of these on the roadways for two reasons: (a) it was at least as hideous as Rosie O'Donnell without makeup; and (b) it had all of the reliability of a mechanical watch made in Beirut.
Honorable Mention: The Ford Pinto
Only about 125 people died after their vehicles blew up in collisions due to a faulty gas-tank design. So, overall, your odds were pretty good at survival. Though your odds of surviving the embarrassment of driving one weren't nearly as high.
The 10 Worst Car Names Of All-Time
Looking for car names that offend? You’ve come to, well, here. To simplify things, we’ve omitted non-U.S. vehicles like the Mercedes Jew-Chaser and the Chrysler Colonizer.
Damn… I had a Pacer, a Gremlin and a Pinto😞
Well.... The last car wasn't ugly
It just killed people