He’s nerfed fairly in 3rd strike. Slow normals, low stun gauge and possibly the lowest stun meter in the game, weak air fireballs, overall a slow character and sometimes predictable to counter. His juggles are insane though.
Akuma is not even top tier in the game. I played this extensively last decade and I’ve seen players like Kuroda turn this character into the ultra dark hadou killer OCVing the entire team at Super battle opera tournament years ago.