I tried to play through AC Black Flag for a second time but I got sick of the game before the first mission. I have found that they have got away from what made Assassin's Creed great. They moved you from the great gameplay in cities and towns to spending most of the game on a pirate ship and small shanty wholes in the wall with nothing to do. I have found that the early AC games are much more fun and you have a wide range of things to do then they give you in the AC III and AC IV.
I have not played the Newer game Assassin's Creed: Rogue yet but once I do I will start a new topic and post what I think without spoiling the game for whoever wants to play it.