Good player : Can react to your shots.
Great player : Can anticipate your shots.
Good player : Can occasionally apply pressure on you with some shots.
Great player : Can constantly apply pressure on you with his shots.
Good player : Knows some deception.
Great player : Knows when to effectively apply those deceptions.
Good player : Runs quickly around the court.
Great player : Times his movements so he gets to the shuttle at exactly the right time to conserve energy for injected pace lethal shots at the right moment.
Good player : Can hit a winning smash if given the opportunity.
Great player : Will create opportunity to hit a winning smash.