#1 The Undertaker living his gimmick
We appreciate The Undertaker a lot, but it is the man behind the character-- Mark Callaway --- that deserves the credit for making this gimmick such a huge success. The way The Undertaker managed to keep himself out of all the limelight for all these years just to protect the mystique of the gimmick speaks volumes about his professionalism.
He avoided out-of-character appearances, social media, interviews, and whatnot for all these years. He even started wearing only black or dark clothes. In Vince McMahon's own words, he lived his gimmick in every sense.
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WWE Superstar Bray Wyatt mentioned on the Last Ride how The Undertaker was always at his best, be it on-screen or behind the curtains.
"There’s this typical thing that people say about this place - that your character‘s personality on television is you turned up to ten, but Undertaker is always on ten."
It was finally now that The Undertaker allowed WWE cameras to film his life and reveal his human side. And we as fans can't thank him enough for that as it led to us witnessing what could be the greatest WWE documentary of all time.
The Undertaker is a once-in-a-generation WWE Superstar who has left a massive legacy on this business. He truly is, The Greatest of All Time.