Realistic
Miller was well-known for his ear for dialogue. There's not a lot of poetry in the language. Instead it sounds natural, like regular people talking. Even the most climactic moments register as believable, if dramatic, as when Chris confronts his mother just before the gunshot:
"Then what was Larry to you? A stone that fell into the water? It's not enough for [Joe] to be sorry. Larry didn't kill himself to make you and Dad sorry." (3.175)