8. The Miz
The Miz has had his fair share of success in the WWE. He has won the United States Title, the Intercontinental Title, and the WWE and World Tag Team Titles numerous times. He's also been the WWE Champion, which makes him a Triple Crown Champion, and has headlined Wrestlemania 27 against John Cena. Yes. The Miz has been this successful. See, while he undoubtedly makes a charismatic heel and gets a decent amount of audience heat, it's generally agreed that The Miz as WWE Champion was an enormous error in judgement on behalf of the Creative department. His reign only lasted 7 months, and he hasn't been allowed near it since. He continued to be involved in major storylines for a short time as part of the Awesome Truth, but by the time Wrestlemania 28 rolled around, he was back to competing in the mid-card. Since then, he's been bouncing up and down between the preshow and the mid-card, and is unlikely to ascend to the main event scene again.