The cooldown is 17 seconds during laning phase and 11 at rank 5 (assuming no CDR), and that only starts counting down AFTER it's dissipated, but okay.
Other than that, her new shroud is a lot better than her old one was in terms of fairness. No more blink, she actually has to use it a lot more intelligently and while her tower diving is pretty strong (she will still take turret damage with every single procced attack/ability), pretty much every bruiser/assassin and hell, even mage has better diving capabilities than her current form, because she relies on DPS and poke more than anything now. It's also her only source of safety in lane, and if she uses it all the way at your tower and your jungler doesn't capitalize on that immediately, well that's just low ELO things I guess. Same as her old shroud, don't fight her in it, because you'll automatically lose that trade. I don't know why people have always been adamant on fighting her literally in the middle of her shroudwhere she can easily proc 2 or 3 passives on you. Once it's done, Akali is actually very squishy and blows up.
Maybe the true invisibility should go, but other than that, it's a LOT better in pretty much every single way than her old shroud was.