The thing is that while i was going towards the carriers with my crusaders/illuminators (split in 4 groups each to FF 1 carrier) the fighters/bombers did a massacre to my fleet. The best bet was focus his caps (usually the AI tends to retreat after losing/getting badly hurt his caps) but i didnt that, ill try so next time.
The defenders (wich are supposed to protect the fleet against strikecraft, and i had about 25 of these) did nothing more then run around like headless chickens (if you want to micro 25 ships to attack a bomb squad each while taking care of the rest too, go ahead Oo).
The only anti-craft ability i can think from advent caps is the kinect push (or how its called) from the carrier, wich doesnt do that amazing damage even on level 3, and it wont take care of a 100ish craft army.
The point stands still: why run thru all that hassle when you can just build more strikecraft? They are virtually unstoppable, and a balanced swarm (70% fighters, 30% bombers maybe) can take care of pretty much anything? Strikecraft spamming for advent seems even more valuable due to the lower energy weapon cooldown passive aura from the carrier cap (again).
You could just trow a couple of radiance, crusaders and guardians to take care of the "ground" survivability... Maybe its just the way advent has to be played?