7. Eddie Murphy
Mike Myer's donkey sidekick in Shrek, Eddie continues to be an enigma to those that remember him when he was making us pee our pants in his red leather suit from laughing so hard. To this day he is one of the all-time biggest money makers according to Boxofficemojo.com, however 4 of his top 5 titles are for his voice over work in Shrek. Beverly Hills Cop, the movie that made Eddie Murphy Eddie Murphy is his only live action role. Yet his early success in movies such as Trading Places, 48 Hours, and family friendly fare such as the remakes of the Nutty Professor and Dr. Dolittle made him box office certainty.
So what happened? Eddie hates co-stars. He leads the league in dual/triple/multiple role-playing themed movies. And the problem with that is when you are acting against yourself, you aren't being challenged. It's like playing with the cheat codes on. There's really no challenge and without the challenge, there's no reason to try to exceed your limitations. Eddie seems to know his limitations and instead of being called out on it (ie by starring with others of similar or stronger talents) he is content to follow Mike into the sound booth, act like a donkey and collect his paycheques.