Leigh Brackett, The Best of Planet Stories 1

"Space opera, as every reader doubtless knows, is a pejorative term often applied to a story that has an element of adventure. Over the decades, brilliant and talented new writers appear, receiving great acclaim, and each and every one of them can be expected to write at least one article stating flatly that the day of space opera is over and done, thank goodness, and that henceforth these crude tales of interplanetary nonsense will be replaced by whatever type of story that writer happens to favor — closet dramas, psychological dramas, sex dramas, etc., but by God important dramas, containing nothing but Big Thinks. Ten years late, the writer in question may or may not still be around, but the space opera can be found right where it always was, sturdily driving its dark trade in heroes."