If you spec into the slow there's the oomph imo.
I disagree with that. Sure, there are talents there, but they amount to jack all in actual discernible oomph. You get more slows or more AA throughout the tree, but the actual poison really never does more than sit on the health bar. If you can't AA enough to compensate you are useless.
That's part of what they were discussing with her recently on THH IIRC (or it may have been one of the other pods, can't remember).
The W doesn't really do anything like you would expect it to...it should be the abililty increasing damage with stacks or what have you, but instead it's impact is pretty damn negligible - not because it's bad but because the poison itself is so lackluster otherwise. Big woop, I slowed em. Now what? Still can't kill em before I get my dick pushed in.
When you pop W it should do something bigger with talents besides more slow or helping your AA. It should be talent-able for damage because it's the perfect detonator for a stacking debuff.
YMMV, but that's where I think she needs the help. Fixing her stutter and health is nice. Not sure it's gonna be enough to make her damage viable, though. Maybe if the stun meta gets rekt the whole argument becomes moot because she can get into fights and back out like she was designed to do...right now, she's just a backline shit-thrower who throws shit that sticks but barely stinks.