It's not. Its only a waste when you don't get the kill. We're not going to wait the entire game for the "Perfect" moment to kill the entire team, We're going to use it when we think its necessarily. For example, say your playing as a Striker Titan/Voidwalker Warlock and your on a kill streak but you see someone like a Skate Titan or a Blink Warlock/Hunter with Shotguns. You're not going to let them get the kill, you're going the Super the Shit out of them to preserve your kill streak. So as long as you get one kill with your super its not wasting it.