Only when used right. Overall, OG Sunbreakers were the most powerful class in all of Destiny in it's short time. It was very difficult to use Stormcaller properly, and only by using Ionic Blink and Transcendence did we have the ability to dodge those homing hammers and have the Super duration to take them down. But seriously, do you think anyone would even bother Warlocks if the others subclasses were in their absolute prime?