1967 Pontiac Executive (Worst)
The 1967 Pontiac Executive is not a well-known model like the GTO or the Firebird. The Executive had a distinct style, very different from the rest of the lineup. The Executive replaced the long-running Star Chief model in the lineup, although the general consumer did not embrace the new model (via Fifties Web).
The 400 CID V8 would propel the Executive with authority. The problem was the massive curb weight of the car. Pontiac had pivoted to be the excitement brand in the GM portfolio. The Executive just never caught on with consumers who entered the Pontiac showroom with excitement on their minds.