#2 King Corbin
He's one of the few last real heels in the professional wrestling industry.
You probably hate him but that's because he's doing his job well. While some of the dog food instances with Roman Reigns might have been a little juvenile, it still netted the King great heat. Every person that he interacts with immediately has the backing of the fans. Just look at the reaction that Shorty G received during the King of the Ring Tournament.
It was also during that tournament that Corbin put forth some of his best matches. He was always one of those fringe stars who would always be in the mid-card and occasionally jump into the main event when needed. Working with a talented technician like Shorty G displayed that Corbin had improved his game over the last few years.
A lot of his game early on was rest holds, strikes and transitional moves until he got to his big guns - the Deep Six and the End of Days. Corbin has improved to blend the rest of his moves with his finishing moves. He's also greatly improved his mic/heel work so much to the point that you just want him to go away. That's what heels in wrestling are supposed to do. Shaving his head also improved his overall look.