5. MVP
Montel Vontavious Porter made his WWE debut in 2006 as a coveted free agent signing on SmackDown. His first major feud was against Kane that culminated in an Inferno Match at Armageddon that same year. MVP had charisma, he can talk, and he can put up a good match.
However, all of those qualities were not enough for MVP to be crowned as WWE champion. He held the United States championship twice, as well as the Tag Team titles with Matt Hardy. The WWE just failed to book him properly so that fans did not care about his character in the later years of his WWE career.
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In 2008, MVP was on a losing streak and he never really got a one-on-one shot for the WWE championship. He was released in 2010 and continued his career on the independent circuit. MVP had stints with Ring of Honor, New Japan Pro Wrestling, TNA Wrestling, and Lucha Underground. He returned to the WWE this year for a cameo in a backstage segment during the 25th Anniversary of Monday Night Raw.