my normal elo is higher than most non-high-ranked smogoners, plus it is actually positive. it's just the fact akali is so easy to abuse early on also they are really bad akali's but even a good akali can't carry past a certain point in the game. if you don't lose before full build akali can get shut down or cc'ed the second she jumps in and die to ad carry crits.
also I lied I got over 100cs as akali but my botlane lost so hard that their blitz came mid at lv3 or 4 ?? and never left so I was 1v2 against zed/blitz and couldn't do much, especially because bot died 2v1 as well `-`
shaco had one of his highest win rates in platinum in s2, does that mean he is actually a good champion? no, if he doesn't get fed his teamfight potential is weak and his splitpushing is hampered. anyone who mains a champion and plays them enough will understand them and their interactions enough to do well, even a karma/heimer main would probably be able to win in diamond elo if they knew the champion properly and outplayed their opponent. doesn't mean the champ itself isn't outclassed.
I think the only thing akali does better than other assassins is quick single target burst at like 6 but even that depends. there is really no reason to pick akali except you like to play akali.
I also saw a high elo featured game (before diamond so platinum) akali top go like 0/8 or 9 vs top skarner, he got 0 ganks as well. so if you are VERY VERY GOOD at akali you can do work to a certain degree. otherwise she is outclassed and not worth it to pick. I think she is fun but meh she eats dick vs bruisers mid and if your botlane (not naming names.) is getting 2v1'd so you have to 1v2 and hide under your turret then get dove all day as blitz tanks it while you try to run in your shroud, well, why not just pick morgana and shield his cc while hitting w to farm.