Maybe it's just me, but as someone who used primarily Clown and Mechanic, Ninja just feels super clumsy and awkward.

The grapple doesn't go far enough to mean anything (most rooftops/balcony's you can grapple to can be accessed by simply jumping and pulling yourself up or jumping on the door and then jumping on the roof), the animation time is like 1.5 seconds to fire it, and then depending on the distance up to 2-3 seconds to pull yourself to the spot. I watched some Call of Duty Blackout gameplay, and the grapple in that is much better. It goes further (or appears to at least) and works faster. In the middle of a fight, using the grapple on mobile will get you killed because by the time you finally start pulling yourself, the enemy will have half his clip unloaded into you, and the travel time is so slow when you pull yourself that anyone can just kill you while your midair.

My suggestions are to decrease the cast speed by a little bit, increase the grapples range, and increase the speed at which it pulls you. Its a NINJA class for gods sake!