#3 Fans are tired of babyface Edge
SummerSlam 2004 was held in Toronto, Canada. After WrestleMania 20, Edge had finally made his return to WWE after being on the sidelines for months on end due to an injury. By the time SummerSlam rolled around, he had defeated Randy Orton to win the Intercontinental title.
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At the PPV, Edge defended his title against fellow Canadian Chris Jericho and Evolution's Batista, in a Triple Threat Match. To everyone's shock, Edge got booed by his countrymen on various occasions throughout the match. WWE soon turned Edge into a full-fledged heel, in what was possibly the decision that changed Edge's career for the best. Edge went on to become one of the greatest Superstars of his generation and was inducted into the WWE Hall of Fame in 2012.