Well for starters, she was pick-or-ban status for the all star event (both in 5v5 and 1v1 play). Pretty sure the best pro players have a better idea of what's broken OP and what's weak.
As for specifically laning in regular elo? Zoe's one weakness / not OP-ness is her laning phase. She isn't necessarily an oppressively strong laner (although her 1v1 pick-or-ban status would argue against that, the reason for that was largely her W making her very effective at winning all-ins which are forced due to the 'race to 100 farm' mechanic that doesn't exist in regular games, not to mention the taking of combat summoners in 1v1 instead of flash, and that no one can gank her [which her relative immobility is a weakness to her laning]).
All that aside, so what makes Zoe OP in regular play? It's not in lane dodging her E or Q. It's a jungler trying to dodge her E from out of vision and through walls when she sees you in the river. A level 5 Zoe sees a level 5 juggernaut jungler in the river at 80% HP? Instantly bursted to 0HP with little counterplay, despite her not even having ultimate yet. Bad enough that a Zed or Syndra can make that punishment at level 6 by burning a high cooldown high pressure ability, but Zoe can do it pre-6 and without burning any notable cooldowns. Her E is pretty easy to hit and way too reliable when there aren't minions around, and she can dominate teamfights with it. Basically if Zoe is in the game, anything outside of the 3 lanes becomes way riskier (including Baron and Dragon). There are other champions (e.g. Rumble or Twitch) that make these areas high-risk as well, but those champions are balanced around other weaknesses that Zoe just doesn't seem to have when played well (and lets be honest, people weren't happy about Twitch either).