The balcony scene is unrealistic first of all, and probably most obviously, because the two teenagers have just met and they are swearing to love each other forever and deciding on marriage. Many students react with surprise, if not disgust, when they first read this scene. It's too quick, and rash, just as Juliet says in the scene. Second, Juliet protects her virture by refusing to go further with the relationship unless Romeo marries her; that was perfectly heard of during Shakespeare's time, but today people would laugh if that is the only reason she wants to marry him. Finally, it is doubtful that many of us these days would ever hear the beautiful language spoken between the two lovers in real life. The rich figurative language isn't something adults use, let alone teenagers. If everyone had a metaphor, simile, or personification to shape our thoughts and feelings, I bet there would be better communication among people. Everyone would understand by pictures what the other is saying! How wonderful would that be? Yet, not realistic.