The Thorn isn't good until you unlock everything for it, which takes forever. For the past week my only goal has been to get the Ice Breaker. Everything I've done has been part of my quest to find it. I've probably gone through 100 legendary engrams and I just hit 53 cryptarch. I hate this game so much. Once I find the ice breaker my heart will be at rest, but until then destiny is my life.