#2 The Undertaker putting over some questionable "Superstars"
The Undertaker has long been a WWE locker room leader. So much so that the WWE roster made him the judge of the famous "wrestler's court" that used to be held backstage on occasion. This is just one of the many signs of the massive respect every WWE Superstar had for him.
In the final chapter of The Last Ride, Randy Orton mentions how The Undertaker helped put him on the map by selling his moves during their first match together, even when Vince McMahon had not approved it. While putting over new talent is seen as a responsibility of established names like The Undertaker, it is not something that should be done lightly.
Fans rarely saw The Undertaker taking a loss, and whenever he did taste defeat, the Superstar picking up the victory usually received a massive boost. Take, for example, Brock Lesnar, who rose to a different level of stardom after breaking The Undertaker's streak at WrestleMania 30.
With that said, there are a few losses in The Undertaker's career that didn't end up serving any purpose. Once such instance of this occurred when Vladimir Kozlov pinned The Undertaker clean in February 2009 on SmackDown. Now, I won't be surprised if many of you don't know who Vladimir Kozlov is - as he did not go on to have a very impressive career. Even at the time, there is no denying that he was not ready to be pushed in such a massive way.
A similar story unfolded when The Great Khali destroyed The Undertaker at Judgement Day 2006. Is he a giant? Yes. Is he larger than The Undertaker? Yes. But that didn't justify him going over the Phenom in such an emphatic manner. The decision looked even more questionable once WWE started using him in comedy segments a little while later.