I used to play a lot of akali. Back when her ult had a longer range, it took a dedicated rune page to activate both her passives, when her shroud gave armor and MR. So I've seen her growth and decline. The changes to her E which proc her mark made her slightly too strong, tho right now I feel if they brought that back it wouldn't make a difference still to her state. Abysmal laning phase, revolver no longer gives spell vamp (indirect nerf), mid meta is long range mages which make it very difficult to lane. The removal of green wards forces everyone to buy pinks which is another indirect nerf, no form of CC in kit, the ult changes to dashing behind and the nerf on the range makes her feel clunky as fuck especially the wind up animation on the auto after you ult to proc the mark.
It makes me sad, because she used to be fun to stomp with. And Diana kinda does everything she does but better, they're still not worth picking because of their horrible early games and being melee without enough range.
This is all assuming you were referring to AP akali, idk much about the tank akali because that just felt wrong and I never tried it lmao