#3 Enzo and Cass not winning the Tag Team titles at WrestleMania 33

It's no secret that Enzo and Cass were one of the best tag teams of the modern era of WWE. Sure, their characters were a little gimmicky at times, but it constantly sold merchandise at the same level as many of the company's top stars and had fans all around the world, chanting their ridiculous catchphrases every time they appeared.
Again, a little gimmicky at the time and Enzo Amore was hit or miss on the microphone at points, but this was something that The WWE Universe was firmly behind. Furthermore, WWE themselves seemed to be fully behind the pair rocketing up the ranks in the tag team division but never pulled the trigger on giving them a title run.
Unfortunately for Enzo and Cass, backstage issues eventually ended up breaking them apart and Cass's leg injury a few months ago only hurt both superstar's stock within the company. With that being said, WWE made a good decision by putting Amore in The Cruiserweight title picture and giving him his own stable, but it's not going to make up for what has already been lost.