Black Flag was amazing indeed. But you don't need to ask for a direct sequel. There is Rogue.

as i've just found out. hopefully it gets ported to the PS4 within 6 months. 

For perspective I failed or died in AC1, AC2, AC:B, AC:R less than a dozen times total.  The games made perfect sense as to how to play and win (I admit you could argue they were a bit too easy).

AC4:BF I failed the FIRST sailing mission 15 times before calling it quits. I couldn't come to grips with how to control and battle with the ship.  Can blame that on me, but naval combat is not why I played AC.

AC3 is the among the worst games I played last generation for being utterly broken.  Never on a console (and rarely on a PC) have I played a game with more glitches and issues.  I kept "failing" because the game would freeze or have me fall through the world or just not understand I reached a check point.  Not a hard game, just a broken mess of one.

So, AC4:BF was at least finished, they just took it a direction that I did not personally "get".

I just want a pirate game without or almost none of that stealth stuff, and I want it to be a huge world where you can join groups, hire more people etc...

Actually for some reason Black Flag just can't hold my interest for too long. I never get the urge to pick it up and just feels underwhelming when i'm playing.

Rogue will most likely make its way to PS4 within a year.

It should be much less than 1 year.  Otherwise it will comete with next year's current gen version.

"Within a year", most likely 6 months after it's initial release on last-gen consoles.

Blag Flag was a better Pirate game than a AC game. I got it on my Wii U and loved it 100x more than AC3, which is odd since I love the time period from 3 more than I do 4

Or... even better: ASSASSINS CREED BLACKFLAG: ZOMBIES!