His is the only one that gives plus +1 on normal hit and on counter hit leads to some nasty follow ups
His jabs are nifty as they give +1, but that's all they give and Sarah and Pai have frame advantage in much more abundance. His only frame advantage moves are his standing and crouching jabs and his 214p which is a short range 23 frame mid punch (which also gives a measly +1). The advantage is nice in a game where everyone is at negative 90% of the time but he's not exactly all that fast and blocking after the jab will typically put him at disadvantage. In the case of his mixups (IE Guard breaks, throws) you can just crouch and his pressure is over all the same.
Also he is the only one who gets full combo dmg while an opponents's blocking which is all guaranteed.
His guard breaks allow for deeper mixups and crippling an opponent's defense and his best guard break option gives a nice 80 points of guaranteed damage which is great, however both of his guard breaks are crushable, SS'able highs that can even be ducked. His guaranteed options are nice but the most damage he gets out of them is generally around the 60-80 mark which is nice but will require him to open up his opponent up a good 4-6 times before the round is his.
His big damage lies in his stun game combos which forces him to *gasp* guess. 16F+P is the best grab in the game as far as the stun game is concerned but can be slow escaped so his mixup options dwindle down to around 2 or 3 options and his single strikes don't cause much stun and he's prone to be quite predictable.
On top of that his tracking moves are few and far between and that becomes even more prevalent in 1.03 and his range is garbage. He's got fluid movement but his horrid range and unsafe ranged attacks make him crap as far as the spacing game is concerned.
His damage his colossus if you can get started with him which will happen, but his guaranteed situations pale in comparison to the top tiers as far as damage and practicality which forces him to play the stun game on top of bad range and easily sidestepped attacks. He's high tier for sure, but his flaws are far too glaring to consider him a top tier character. And this is coming from an Akira main.
His strongest point was his damage, which was buffed. That's why he stepped up in the tiers and that alone was enough. On the other hand the buff to SS is a huge nerf to him in actuality.