I think what makes a good play is how it's sold to people, the delivery! like how a lot of movies that would go down into history has amazing timing, soundtracks and acting/Voiceovers! timing and pacing has to be a major part in this, to give a good play or movie the pacing has to be fast enough to keep the watcher hooked but also slow enough to keep the movie steady! See if the movie was too fast paced, the watcher would be confused! imagine if you were watching a movie and they were making a plan about going to war and then in the next 5 minutes they are IN the war! they didn't show the preparation, the lines, and the oh so dear character bonding and development! they won't be able to see the character grow if the show or movie goes to fast to let them experience the personalities!