Idk if its just a me problem but when using the grappleshot it often seems that the spot/object/player i want to grapple is either too far away or cant be grappled for other reasons (eg when trying to grapple the top of a tree to lunge myself across the map).
I think there should be an indicator on the HUD when the grappleshot is equipped, showing if the spot youre looking at is in range. Other games featuring a grapplehook (eg Just Cause) do this and it makes using it much easier
There is its a little yellow x in the middle of your crosshair
Havent noticed this, ill look out for it next time