I have rated this series 4/5 because there is no such thing as a 100% perfect series
This series is without a doubt one of the best series I have watched. It doesn't hold back with its dialogue as you will soon see upon watching this series. (if you do not like swearing I suggest you avoid this series)
The dub for this series is up there with Fullmetal Alchemist in terms of quality, yes it is that good. And it wasn't even done by FUNimation.
The story centers around a group of modern day pirates who recruit an, at first, unwilling average office worker called "Rock". The story revolves around Rock and how he is thrust into the dirty underworld of piracy and how he adapts to his new life. Every character within this motley group of pirates have their unique quirks. From Revy the beautiful gun toting, murderous mercenary who can't help flying off the handle in a fit of rage to Dutch the cold yet very cool and calculated leader of the pirate group.
This series is not for kids, with that said, watch it! You won't regret the decision.