I assume you mean Pirates of the Caribbean Online?
If that is the case I played it for a while, hell I was even subscribed for about 2 months.
That is until I reached around level 20 something to which all the missions turned out to be the same after a while. Not only that but I never came across any Krakens like the original trailer for the game promise.
I unsubscribed 2 months after signing up, but I still sometimes regret it seeing as it does pass the time no matter how repetitive it can be.
Although I must admit, no matter how repetitive it was, the whole feel you get when you're on the ocean sailing your boat (which ever size ship you may have) to your destination is very true to the movies; the music helps too. Honestly though if Disney sold this thing as a separate entity all on it's own, with updated graphics, weapons, customization, etc. I'd be worth the 10 bucks subscription every month.
Now Pirates of the Burning Sea is like this only it does everything that Pirates Online does not and then some, although I haven't picked it up either. I do plan to though seeing as it's got much more customization, weapons, factions, classes, etc and the graphics are much better improved. You also get a your own crew if you don't feel like teaming up with a lot of people online; the PvP is also much better from what I hear.
YouTube - Pirates of the Burning Sea Review