Zoe is so weird.

It's not feed. It's the fact her skill shots are small in size, and her overall kit generally doesn't compete with champs who have more options, and she generally sucks in a team fight.

It takes Zoe 2 long range Q's to clear 1 minion wave, which is not realistic. You might get 4 of 6 minions, while the opponent gets all 6, and it doesn't take them as long to set up.

Zoe's "Burst" isn't even all that high until she's fed; if she gets fed.

I've actually played a "Faker" like game with Zoe, where I never missed anything, and had max CDR pretty early and was tricking angles. I managed to get like 9/4/7, because Zoe vs people who know how to play simply spends most of her game trying to clear minions to set up the kills.

She's also very team reliant, so her carry is much weaker than other mids who legitimately carry their teams solo, like Xerath, Ahri, Talon, etc. If her team fails, she fails.