#1 He loses more often than Cena
According to the wrestling database Cagematch, throughout his career, Roman Reigns has won 67.1 % of the matches. The data, as of July 8th, 2017, indicates that during his time with the promotion, Reigns has been in a total of 765 matches, and has won 520 of those matches while losing 225 and 30 matches have ended in a draw.
While he won a higher percentage of his career matches in 2016, this past year has seen Reigns lose more matches. In comparison, Cena has won an astounding 78.8 % of his matches.
Whether it is on television or on a pay-per-view, Reigns isn't indestructible, and there isn't always a happy ending for him and his feuds. He has faced the wrath of Braun Strowman, frequently appearing badly beaten even in victory.
He has lost to Seth Rollins, Finn Balor, Samoa Joe, Braun Strowman, Kevin Owens and Chris Jericho on more than one occasion. While he has feuded for the Universal Championship, the same could be said for the likes of Seth Rollins, Goldberg and Brock Lesnar. Fans can anticipate Reigns getting knocked down, but that doesn't mean he needs to stay down.