7: Mercury Cougar
The Cougar has gone through many changes over its lifespan, but the 1970s were an especially confusing time. The car started sharing almost all its propositions with the Mustang, only to be redesigned later on. The mid-1970s were especially strange, as the car moved away from the traditional Mustang styling of the past. The car had a large front fascia and this was elongated by the rear (via Repair Pal).
Style-wise, the Cougar was no longer the unique car it once was, and enthusiasts started to question what was going on with the car. Ford was having a tough time placing the Cougar in its own unique spot in the market. Nowadays, the car has made a resurgence because of its Mustang underpinnings and unique styling.