Also broadsides + missiles = fail... if you could fire missiles in any direction you want that could be fixed... there's yamato for only forward and you could also add torpedoes:
missiles : weaker ( not necessarily weaker than they are at the moment but weaker than torpedoes ) , directional ( used often )
torpedoes : stronger , only forward ( lower number , maybe cooldown ? , also a lot more expensive and slower - easily dodged by smaller ships )