For a free to play game, this game provides a huge ammount of really good content.

Its a really well made and epic history (still missing the 7th ark, and for those history hunter gamers, devs told it will be out soon in some kind of update), with really, really good orchestral soundtracks all over the place.
Characters are extremly well designed, with proper interaction betwen them.
The open world Sailing, its super awesome, and the island system its something u will for certain enjoy.
Just to you have an idea, wen you are leveling up to level 50, wen u unlock almost every feature like, upgrading armors, gems etc, its basically a tutorial (its a tutorial who lasts hours..and hours).
You have Co-op events every hour (24/7), who will have huge impact in the progress of your character, or characters.
The pvp system is a fair skill based matching, besides my understanding that have a huge breakdown with stunlocks.


You will have a really fast progress if you use the item shop in the game(buying upgrade materials with real money), and even if you play it completely without the item shop, and dedicate a tremendous ammout of hours on it, you still will be behind of those who invested real money on (this can be applyed to almost or maybe all games who provides similar features like this).

The game is really well design to have some kind of delusional balance betwen players who invest play time, and those who invest real currency.

This is a very resumed and general Analysis.