You know what my favorite part of a story is? The dialogue. Seriously, because when it’s well done, it’s just so much fun to read. At least, I think so. Give me a good conversation and I am totally hooked. I love the interplay between characters, the back and forth that tells you so much about who they are and how they relate, to the person they’re talking to, to the world they’re in, to the story.
I love it when characters argue, or have a discussion where they’re at cross purposes. I love it when one character is saying one thing—and the reader knows it—and another character is hearing another—and the reader knows that, too—because I think it shows the depth of understanding the author has for the characters, and has given the reader. You know? You can’t have two different characters, talking about two different things, but thinking they’re talking about the same thing unless you know how they think!
Did that make any sense? The point was, I love it when an author knows a character so well that the words coming out of their mouths make real sense, because we—the readers—understand that character, because they’ve been explained to us by the author. (Although, hopefully through the cunning use of characterization and not because they’ve literally been explained.) Dialogue takes on a whole new depth when the reader really gets what the character is trying to say, regardless of the words they’re actually saying.