Why is akali so bad right now?

I was going to learn Akali {{champion:84}} , but on all these sights (op.gg, champion.gg) her win rate is disgustingly low. Is it because people havent mastered her and they are losing a lot or was she nerfed? Any akali mains or anyone with more knowledge about her win rate? Is she worth picking up for fun and playing?
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