Ashe works as intended. She is a marksman/utility/support character. You don't pick your champ in a vacuum. When you pick ashe for a team comp you realize your giving up hyper-carry damage in the adc slot for added utility. Her entire kit is geared toward it. Her Q is a perma slow? What other adc in the game has this ability. Her W is a wave clear +damage ability on a really low cool down. Her E gives you vision half a map away +gold on monster kill. And her R lol. Burst damage/global range +stun?? Super powerful when put into the adc slot.
However, most people don't realize when you pick ashe you must build a teamcomp that shores up some of the damage she loses because of her utility. She doesn't do as much ad damage as a hyper-carry? Well keep that in mind when you pick your top lane or jungle.
She is not a "put all your eggs in one basket" champion. Spread the damage around the team.
Example being, why would u ever take Mundo when ashe is adc. Mundo offers nothing to the fight damage wise. His tanking in the frontline hurts the team because he doesn't do any damage ; /.
A much better pick for the top when ashe is adc would be Darius. He can build tanky and STILL do major damage. Add on the fact that darius doesn't chase very well gives awesome synergy to ashe's Q.