Hawkshot.
It is actually really good for scouting, but then what? It doesn't really give any other utility. If you have a good team that is paying attention it can be amazingly useful, but otherwise, at best you get an idea as to where the enemy is so you can try to land your ultimate. But even then, you kinda just gave yourself away and you still have a high chance of missing.
Personally, I would really like to see it give her a burst of movement speed with very low base numbers, to the point of it being uneventful on AD builds, but give it a strong AP scaling on either its strength or duration. This would make AD Ashe virtually unchanged, and make AP Ashe into a mobile sniper.