Why is professional wrestling entertaining?
Professional wrestling is one of the best forms of entertainment.  First, it's an incredible display of physical talent.  Professional wrestling and acrobats are showcasing their physical attributes in a partially choregraphed dance.  There is an element of improv in professional wrestling.  Wrestlers often are calling the match as the action happens.  The next set of moves can be greatly influenced from the crowd's reaction.  The "pop" of the crowd, if you will.  Finally, the best wrestlers are ones that are amplified versions of their true selves.  The audience can detect an inauthentic speech on the mic.  Those wrestlers who combine their charisma to their true gimmick are the ones that turn the normal fan to a mark.