Kai'Sa feels so utterly weak on her own early game
She has really low range of 500, bad damage with her Q, her passive requires 5 AA and other adc's can do their whole combo before she can even proc her passive damage once due to her really low attack speed, her E charge takes a full second to charge preventing you from attacking and the duration of the attack speed is too low not to mention the ability itself has a really long cooldown.
After playing many games with her she's rarely good but as of right now she's just so underpowered.