I'm more of gamepad guy but I think that it's all in question of getting used to and since I've been playing only couple minutes, I couldn't really feel the length of a grappling hook and when I wanted to keep going on wall last grapple point was on the floor behind me and I was losing momentum.
I've found no bugs (maybe one - when you are very high you can shoot grappling hook into air but it doesnt really do much, you fall normally)