Capital ships, especially battleships, are balanced around being the core of their formation. Their role, or at least how it's intended, is to let smaller ships deal with immediate threats, while capital ships deal with larger ones, which in theory isn't a bad idea, but the execution as always is hit or miss. The fact that larger ships only really have flaks to deal with snubs now can be a pain to get used to, since traditional anti-fighter weapons were nerfed into the ground to the point that it's almost useless even mounting them anymore.
The gimmick with shields is to disable your regen (there's a setting you can make to hotkey it) so your power core can recharge normally, but this obviously doesn't work when you're being focused, and is practically a death sentence if you're in a battleship given their lack of flavor components to soak up damage. This is set to be remedied with the battleship rework, but who knows when that'll come out.
I personally stand by my belief that cap balance was at its peak right before the first cruiser rework, when it was clear which ships countered which, but it was still possible for caps to come out on top with enough skill input, even against snub ganks. Now it's just whichever side has the better snub pilots, with caps being mostly a sideshow.
Granted, I'm biased since I am a cap player at heart, but I absolutely get the pessimism that can come from learning just how gimped caps are right now.