It allows for massive sweeping melee damage that can wipe an entire team when combined with speed boosts or damage buffs (like Ana's Nano Boost).
Genji (守望先锋 源氏), the cybernetic ninja of Overwatch, remains one of the most high-skill, high-reward Damage heroes in the game. His kit is defined by extreme mobility and the ability to punish out-of-position enemies, though he suffers against "beam" heroes who bypass his primary defense. It allows for massive sweeping melee damage that
Genji's ultimate, Dragonblade (Ryūjin no ken wo kūrae!), is a "transformation" ultimate where he draws his katana. the cybernetic ninja of Overwatch