Assassin's Creed Revisit: Black Flag
Assassin's Creed Black Flag is an interesting entry in the series. Its main addition is the fleshing out of ship to ship combat into a full gameplay system which, in turn, makes it the best open-world pirate action game out there.
If you're ever looking for an entry in the Assassin's Creed series to go for 100% map completion in, this should be one of your first stops. The mix of on-foot and on-boat gameplay means that you always have the option of switching your current moment to moment activity while still making progress toward map completion.
As an open-world pirate game, Black Flag succeeds amazingly. As an Assassin's Creed game, it's fine. It's not an amazing entry in the context of the series but there's a ton of fun to be had if you set your expectations to "pirate" instead of "assassin".
So, should you play this game? Well, this is one Assassin's Creed game I can recommend as a very solid open-world game. It's perfect for throwing in a podcast or audiobook and picking away at open world objectives. If, on the other hand, you're looking for a core assassin story then you're better off grabbing a different series entry.