12: Infiniti M35x
The final incarnation of the M series sedan was the M35x, and it was a more sedate-appearing sedan model than before. Infiniti did away with the harsh styling of the previous M-Series generations. The problem was that buyers weren’t even considering the Infiniti M by this point in time. The sedan had become a relic of the past and sales numbers were abysmal (via KSport USA).

Likewise, the Infiniti M35x still suffered from the same reliability issues as previous models. Infiniti hadn’t been able to cement the M35x as a serious competitor against Lexus. The M35x was a decent sedan in many ways, but it was released at the wrong time. There were much better options on the market, including Infiniti’s own G35 models.