6. Brock Lesnar
WWE Universal Champion

A lot has already been said about the Universal Championship reign of Brock Lesnar. Brock has been a terrible champion who rarely comes to weekly shows and has only defended it 10 times since winning it at Wrestlemania 33.
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Surprisingly, the rivalry leading up to Lesnar's conquest was good. Lesnar facing a ghost from his past in the shape of Goldberg who stumped him every time they met was a recipe for success. He finally conquered Goldberg in a stunning bout to win the Universal Championship. Even in the beginning of his title reign, his rivalries with Samoa Joe and Braun Strowman were great. But, the matches were sublime with the challenger getting pinned after only one F-5. His bout against AJ Styles was a solid Match of The Year candidate.
As soon as it became clear that Roman was the one who was going to take the belt away from him, the reign went on a downward spiral. Their matches at Wrestlemania 34 and The Greatest Royal Rumble were pathetic. Since then he has missed Backlash and Money in The Bank thus rubbing salt in the wound. It would be best if he quickly passes the belt and bids adieu to the WWE.