Too Much Dialogue

A writer who overuses dialogue doesn't have an acute sense of pacing, doesn't realize that a work can progress too fast. He relies heavily on dialogue, which means he's also using it poorly, since overuse comes hand in hand with misuse. He might, for instance, be using dialogue as a means of conveying information. He is more likely a beginner, plot oriented, and anxious for a fast pace. Alternately, he might be a playwright or screenwriter turned-author, stuck in the remnants of his previous form. In either case, he is more likely to neglect setting and character development. He is impatient, believes too much in the power of speech, and not enough in the power of silence. And since dialogue rates fairly high on the drama scale, this writer is likely to be overdramatic.

Noah Lukeman, A Dash of Style, 2006