Depends on the character. Some have other options that are better, or they dont want to be in the range to risk it. Mitsuru and Aigis you'll rarely see it (except Aigis using it as part of her combo). Yukiko and Elizabeth's are horribly slow and is rarely used being they are primary zoning characters. If timed right it's a decent option to use for it's armor properties. I personally have cut down use of it so that I catch the opponent off guard not expecting it late in a match.