One of the disadvantages from Akira is the standard non-tracking department. Not a lot of moves of his tracks so there will be some cases where Akira has to make reads and anticipate certain situations. Throwing them if they choose to SS and such. SS isn't a major problem for the character but something common for genuine via both players.
If you SS it properly at a specific time and he enables an attack and missing, you deserved it. If he performs an attack and expects you to SS while actually doing it and he hits you with a tracking or throwing you for it, he deserves it. Situational playout.
Another disadvantage (somewhat but not really big) from Akira is enabling range attacks or getting in against certain characters. Not a major problem since it varies from character to character as well as players commencing the actions and predicting. Totally varies, environment, walls etc etc.
He has some good range moves actually, it's just that it varies against certain characters. Some of those ranged moves are not very lethal for good zoners or characters that can space well in general, however it also depends on the players doing them so it varies a lot.
There are some moves that work well against characters like Hayate for example, but it may do poorly against Ayane or Hayabusa since their ranged tools are much different to approach, whereas also having moves that can work well on those two but can do poorly on Hayate for whiffing.