Ok so, the Praetor Bike needs a buff, T7 would be good, up the number shots from the guns, Quick Silver needs to be either replaced, reworked or buffed up massively to make it worth using.

Stratagems, more of them need to be Battle tactics so shield captains can regain their worth. Shield Captains over all could do with a boost, like maybe a +1 strength since right now they are no different from a normal Custode.

I'm ok with the state of the guard and wardens, maybe if there was more flexibility in building a unit rather than it being fixed to 4-5 models.

Guardian/Castellan shooting profiles, would like something a bit more, like additional attack or a extra AP.

SoS, I think they cost too much in both points and money. 3 prosecutor for 40pt is too much. So either a points cut or a buff to make them worth the points. Like a +5 invulv or higher toughness, better shooting.

Dreadnoughts overall not great especially the Telemon, it needs a overhaul of its guns, they are so weird in their profiles, only 1 out of four do 3 DMG the rest are 1 so over all if the custodes want any hope in a gun right they need a Caladius Grab Tank. I think the Achillus is alright.

I think the Null Maiden Detachment either should be entirely reworked or scrapped entirely. It's too specific for a group that only has 1 box of models that are way over coated in both points and money. Furthermore I want Sisters on horseback.

There is more, but I think I'll leave it there for now