Why is it that i find Kai'Sa 30 000x more cancer than Zoe?

For some reason, ever since her release, i never had a single problem with Zoe, and never got annoyed by her, despite what the general consensus seemed to be about her.

But for some reason, i can't stand Kai'Sa. I freakin' hate her so hard.

I'm not here to compare her to Zoe tho, so let me explain why i hate her:

She doesn't do SH*T

...and then suddenly, she pops off and snowballs so freakin' hard. She doesn't even scale with her player's own skills, she directly scales with how good her allies are, and then she hogs all that glory. "Oh, my team did all the work and the enemy team is almost dead? Let me just jump in with R and get an easy quadra. Woot! Easy, and i guess i'm fed now."

Every time i see her it's the same freakin' story happening again and again. She sits back and lets her team do all the work until she suddenly jumps and deal tons of damage with little hope of fighting back because of her shield.

Riot said they wanted to make another champion that's high risk, high reward, but all she really needs are good allies to make the plays for her.

Her only balancing aspect is that she has no presence beside that or in lane. She just feels like a brainless leech to me. Shut her down in lane, won't matter, if her teammates are good she WILL make a comeback by stealing all of her team's effort. She's on your team? Well expect to deal 90% of an enemy's health only for her to pick up ALL of your kills.