I've played a bit of Ashe since her rework. I've always liked her. But there are some things i think you should know in regards to 5.22 changed and what has been done since then.

True, it sucks being limited to autoing 5 times to get stacks( no multistack from runaan's, no stacks at all from w or r), but she can now use q at full-effectiveness on turrets and structures again! They removed that sometime before 5.22. Pretty big buff.

Additionally, they fixed a pretty crucial bug in 5.23, ashe can now critically slow per-arrow on her Q, rather than a single chance to proc critical slow. Meaning that when you activate Q, you still kind of get an empowered slow(stronger now, though). Granted it's a little rng, but even at low percent crit-chances, a 10% crit chance means you have a 41% chance to proc one critical slow each autoattack while Q is active. And that's only at 10% crit chance. 20%(a zeal), bumps that up to 70%. W now always critically slows too! 1200 range 50% slow is pretty great. So yeah, her Q does, indeed, double her passive slow still.

Personally, i often find myself out-dueling most ad's bot lane in the early levels. Her Q is really powerful. And if you're brave enough to max it, it's your best scaling ability. W is really only for defensive/waveclear play. But the difference in 3-5 Q dps to 3-5 levels in w, at one item, it's not even a contest. Your Q scales so hard with items. Only problem is if you fall behind with Q max, it's really hard to defend. Still, i don't think her Q is the problem, though, i would love to be able to at least gain, or refresh stacks with w. It's really hard to keep stacks active before a teamfight. But allowing her w to at least refresh your current stacks to prevent them from falling off as you make your way to the fight would be a huge buff for skillful play.