Hull/Shields: Average.. Nothing special here...
Actually, Akkan has the highest hull points of any capital ship in the game. Its shields are lowest of any capital ship in the game, but not significantly different from other TEC caps.
Colonize: I do see the value in this. Sure, its not a huge cost reduction, but it is nice nonetheless.
If you do the math on the new colonize, it's better than the old Progenitor's colonize (before it got nerfed). Akkan's colonize is absolutely astounding now.
Ion Bolt: Its a good interrupt and can potentially act as an interrupt or PJI, but aside from that I don't see how it could really be considered a cap killer.
I kill more caps with ion bolt than any other ability in the game. It's an absolutely deadly ability. Remember, it's the frigates that are going to have to make the killing blow, the Akkan is just giving them a free shot. You need sufficient numbers to bring down the enemy cap. When the opponent starts retreating, hit him with an ion bolt and then move your Akkan ahead of him. Keep all your fleet pummeling him as you keep ion bolting him every time it recharges. Often times an enemy will start retreating at nearly full health, and be dead before they even reach the edge of the gravity well.
Targeting Uplink: I see very little point in this ability unless in an asteroid field or when facing off massed SC.
Someitmes this won't be very helpful, other times it changes the entire course of the game. Strike craft and asteroid fields are useful, but one of the top uses is actually when you combo this off with Ogrovs, starbases, or turrets. The stationary starbases and turrets gain a lot out of range bonuses. A starbase with targeting uplink can actually outrange Ogrovs, and with the targeting uplink bonus to the hanger's flak weapons you can even protect it quite well against strike craft. An Akkan guarding an Argonev is one of the toughest starbase comboes to crack. When you combo it with LRM's or Ogrovs already long range units get obscenely long range, making them harder to counter.
FYI, maxed out targetting uplink lets LRM's attack from outside starbase weapon range.
Armistice: So you can retreat an otherwise worthless cap? This doesn't really do anything.. It just hits pause. You can argue that it gives you a bunch of time for reinforcements, but I don't really think that a minute is going to do all that much...
This is one of the most powerful abilities in the game. With missile barrage a little harder to bring out early (solo Marza isn't viable anymore IMO) I personally think this is the most powerful ultimate ability in the game. Free retreats are just one use of this ability. Another is to regroup and heal mid-battle, buy time for reinforcements to arrive, or (one of my personal favourites) buy time for a starbase or defensive structures to complete.