Chrysler Sebring
The Sebring was long the darling of rental car fleets and bargain used car lots. The Sebring Sedan was never a massive success, but it sold in reasonable enough numbers to keep it in production. The latter years of the Sebring were some of the worst. The quality of the car was at an all-time low, and the 2.7L motor was notorious for engine sludge problems (via Hot Cars).
Even if the Sebring was maintained like clockwork, the problematic engine caused many owners heartache. Other options were more reliable than the Sebring was. The interior design was also cheap and barebones, even though Chrysler marketed the car as upscale. All in all, the Sebring was a car that looked good from the outside but was better left avoided.