Melodrama is emotional rather than logical. Melodrama often comes from a character acting before thinking. This could result in a great scene or a fiasco, All writing techniques have assets and deficits. Learning how to make the most of the melodrama in a scene comes with time and practice. Melodrama is an event or a person that is larger than life. This can be hard to contol.
On the plus side melodrama enhances a scene, On the negative side it takes over and shoves everything else inth the background. Used properly there can be an instant rapport between the reader and the writer. Melodrama can cast a spell or be an annoyance. So handle melodrama with care to avoid losing the reader.