Why is no one complaining about Morgana?
Depending on source she has about a 52-55% in Mid as well as 51-52% as a Support.
Honestly I think the biggest reason she's so hard to deal with Mid (especially for AD Mids) is because she can just rush
, do more damage than you, if you're AD you can't even damage her, she can run you down with R, her R goes through during stasis, and she has about 4s of CC where you're forced to sit on her W.