I believe that the Advent have a set of basically underpowered capital ships. They are without many aoe attacks, their battleship could do with improvements, and the Halcyon really could do with an upgrade.
Don't know if I agree with the general thesis, and especially not the Halcyon. That is one of the most useful advent capitalships period.
aoe attacks
The Advent have a lot of AoEs, they are just mostly buffs rather than direct damage like the TECs are (Vertigo, Amplify Energy Aura, Shield Regeneration etc.). Whether that is a good thing or not is another question, but there is no doubt the Advent excel at large late fleet battles, though their strong buffs also make them the most vulnerable to damage AoE abilities...
30/60/90,
With that many targets, and if you're going to make it affect strikecraft, you may as well have an infinite target cap. I'm not sure if it working on strikecraft is a good idea though, but I do agree animosity needs a buff to the Radiance's surviveablility.
#3 Halcyon carrier should have expanded hangar bays. I thing 15 squads at lv. 10 is about right, since that would even the gap between vasari and advent strikecraft.
What the heck are you even talking about? 15 squads is use, I can only assume you're talking about a Skirantra with max bombers from scramble bombers. And while there is no doubt that Scramble Bombers is effective, the bombers from that are temporary and use up antimatter, and are in no way equivalent to owned strikecraft.
You're also ignoring that every one of the Halcyon's abilities is fairly to extremely useful, which few other capitalships can say (*cough* Microphasing Aura *cough*).
However, both the Halycon and Radiance are fairly good capitalships, so I don't know why you'd start a thread about Advent capitalships and not complain about the Revelation.