I have put about 15-20 hours into the Playstation 4 version of Black Flag, and the game is amazing. The graphics are beautiful and frame rate is nice.
There are simply a ton of things to in this game. Lots of upgrades to buy and craft for your Edward as well as your ship. A lot of islands and underwater locations to explore, as well as side activities like hunting, whaling, gambling and more.
Naval combat is a blast. There's nothing like taking on a powerful Royal Convoy and earning a nice fat reward when you come out on top.