17: 1980-1982 Ford Thunderbird
For a long period, the Thunderbird was sort of the go-to car in the Ford lineup. It was comfortable and sporty while offering an affordable price tag. Unfortunately, the later years for the Thunderbird were critical to the demise of the car and ultimately cost Ford millions of dollars in the meantime. The 1980-1982 Thunderbird is one of the most underwhelming versions of the otherwise storied nameplate (via Motor Biscuit).
The main problem with the Thunderbird from this era was its lack of reliability. Other cars were in this same class were much more reliable. The word started to spread, and it negatively affected Ford’s reputation around this period. Consumers were looking for more reliable car brands and Ford was dwindling in the eyes of the consumer. The Thunderbird would get a major improvement in the next generation but it was too late.