AOE CC > W, late game is not good
Problem with that is that you have to get to the late game and in this state of the game you almost never reach late game
alot of people still can't play her properly, lower elo play her more (not effectively, hence the low win rate) because there is simply more people in low elo (ban rate is rougly similar).
That is part of the problem, unlike Yasuo who is still a target for hate you at least need to play him properly in order to outplay and beat your opponent in lane.
Akali however bullies every melee champion without any effort because of how her kit works and she is effectively immune to ganks because of her W and E and not only that if things get rough she can even use her ult to escape
She also has too much escapes and engages and she even has a disengage which grows in size to cover a wider area and also makes her undetectable by turrets for some reason...
All of that makes her extremely frustrating and annoying to play against especially when you are playing a melee champion vs her because you soon realize that all of your attempts to engage on her are invalidated by her E or W or even Ult sometimes...