If you want more Black flag, this gives you a little more of it to do. It doesn't really add much outside of a new story for Adewale who is likeable. The city and few little islands aren't distinctive from anything in the main game and you'll be doing most of the same activities. Perhaps that is not surprising since it is a DLC but it feels rote. The only real new feature is the freeing slaves mechanic. It actually is pretty interesting that there are always more slaves despite how many you free showing the endless horror of the slave trade. I don't know if that was intentional or if they just wanted to have a recurring thing to do but it's something to note.