#5 Batista's 2014 run
WWE's resident Animal and soon-to-be Hall of Famer, Batista returned to the company in 2014, after quitting around four years ago. While WWE expected the fans to give him a heroic response on his way back, fans weren't buying the idea of him returning only to win the Royal Rumble and main-event WrestleMania 30.
Cody Rhodes' uncle is a WWE Hall of Famer. More details HERE.
Batista's return sadly clashed with Daniel Bryan's YES Movement and there was no way fans were choosing him over Bryan, which led to WWE changing their plans and turning him heel. He later joined Triple H and Randy Orton to reform the Evolution and take on The Shield, only to "wave his hands" to the WWE Universe again shortly. The entire 5-6 months run was a big flop!
#4 "Bayley: This is your life"

WWE has delivered many outrageous segments throughout this decade, but hardly anyone compares to the "Bayley: This is your life" one. The segment was so terrible that WWE themselves understood their mistakes and took it off their official youtube channel.
It took place during Bayley's feud with the then RAW Women's Champion Alexa Bliss in May of 2017. Little Miss Bliss brought Bayley's teacher, former best friend, and ex-boyfriend and tried to prove how Bayley's life is miserable. All this ended with Bayley rushing out to the ring, only to get thrashed with a Kendo Stick from Bliss. Hopefully, we won't get a sequel of this segment ever!