Movies series ruined by certain actors.

Fast & Furious, to me, after #4, was ruined by adding Dwayne Johnson as Hobbs, which crippled that series. The series was always over the top, but his inclusion as the FBI superagent was like adding a cartoon character to the series. His constant camera preening, superficial machismo and lack of range in acting, to me, was bad casting. It gave a more comical approach to the script instead of bringing in someone that could have provided a darker, more serious tone. Maybe someone like Idris Elba or Karl Urban.