I was just given a survey by Riot that asked if Taliyah's in game pressure is weak..
Riot honey... that isn't her problem.
The only complaint I have with Taliyah rn is her w. I don't know how many people know this but Taliyah can't cast anything (this includes summoner spells and item actives) while she is channeling her knockup. The only overwhelming problem is that if you miss this you are 99.999999% of the time dead. The w in it's current state is too much risk with not enough reward, although hitting the w can be quite rewarding in many circumstances, missing the w seems WAY too punishing.
I might not be the highest rank but I've played Taliyah a lot. And from what I have heard Taliyah is borderline broken in high elo rn. People who have smashed her high skill ceiling are stomping games like they are nothing! So it might just be me but Taliyah's w just seems waaay too punishing rn. http://i.imgur.com/DjauPVT.png?nodirect