Personally i would love to see secondary classes or advanced side classes for our pirates. Each class is virtually divided into subgroups being able to choose your specialty can really make things interesting ex:
Swash- Poison/bleeds expert / Master of Blades ( high armor peicing and highest damage and can hit group targets)
Witchdoctor- Drains experts / Curse Hexes- Debuffing, heal stopping ect
Privateers - Healing Class / Damage and buffing class
Musketeers- Trap and bomb makers / and Gun slinger uses various types rounds and trick shots to down a enemy.
Buccaneer- Swordman breaking armor, crippling targets/ Juggarnaunt Wear best armor that also protects from magic have knock backs and most resilient in the heart of battle