This is the best assassin's creed so far but not by far. It is slightly better. I really enjoyed the previous installments given the great adventure that involved the story and specially for the sci-fi story behind.
What's makes this one so special:
Very original compared with previous one.
Incredible effect of handling the ship around.
Top notch graphics, specially in PS4.
It is certainly a game made by a multi cultural team. Very well done.
The story behind everything is very deep and well researched and very well put in game.
The sound is nice.
What's I've never liked but it has been improving:
Very repetitive. You have to do thing hundreds of time. Sometime that bored me. Things should be done few times. Not tens or several tens.
Despite of that, the money spent in this game has a very good return.
Please, do not hesitate on buying it.
PD: I haven't played Multiplayer yet. However, this game is all about the story.