It's a high ROF pulse rifle, for one, which are pretty powerful in the current meta. If you get any kind of stability perk on it, it's hella accurate, and handles like a dream. When IB Rift came around and everyone was using Mida (me included) I often found myself switching to the Grasp when I wanted an exotic special, and found it almost just as effective as Mida in combat. It's just such a powerhouse for a legendary primary.