16. 1998 Pontiac Grand Prix
The 1998 Pontiac Grand Prix adopted a plastic-heavy, rounded design that disappointed both critics and brand loyalists. Moving away from the sharper, muscular lines of earlier models, the facelift introduced softer curves and more synthetic materials. Traditional Pontiac buyers found the new look uninspiring and less sporty, causing the Grand Prix to lose much of its distinctive personality and appeal in the process.