For those who love sea beggars, it sucks having them used against you! I finished a game where the netherlands were an opponent and wow... Archipelago vs Naval Power's type of game, and those things started stealing other peoples unique ships and i couldn't mount a counternavy for the life of me.
I will have to learn my lesson and not wait until later to build a navy...
I think that's the key problem with Privateers and Sea Beggars, once you get on a roll with them it becomes very difficult to counter. So far the best solution I've found to take on a large number of Sea Beggars/Privateers fleet is to beeline for Submarines instead of Ironclads. It's a few techs off the centre of the tree, but the difference between Subs and Ironclads in handling Privateers/Sea Beggars is huge.