Akali is getting gutted in the next patch, 9.3. She will no longer heal with her Q, and her shroud won't hide her from turret shots.
They intend to put power back into her kit elsewhere, but their current mentality with problem champions is to totally remove what makes them problematic, watch to see where they're struggling with those problematic abilities as a crutch, and fix those.
Regardless, Akali really isn't that hard to play around. Her damage is lower than most other assassins. Yes, she currently has sustain, and yes, she can tower dive easily, but until she's fed, she really can't 100-0 somebody, especially pre-6. She depends on her shroud to give her the extra energy she needs to trade. If you can force her to use it, you have a long window where she can't really fight back, so you can get aggressive and start dishing out damage.