On first glance, One Piece is not too different from other Anime series. It has hilarious, roll on the floor from laughing humor and so much action it makes you wonder if the crew ever gets tired.
But in its core, One Piece is about something else: it's about nakama. Nakama, a Japanese term generally referring to comrades, receives a completely new feeling in One Piece. Stand by your nakama, believe in them no matter what happens, no matter what anyone does or says about them. Help them in any situation, even if it means putting your own life on the line. With you nakama, you can do anything. And it is this extreme sense of comradry that makes you fall in love with the characters and wish you could be a part of the strange little group.
It also teaches how humans are allowed to have flaws; in fact, all people do: seemingly perfect Swordsman and first mate Roronoa Zoro has no sense of direction whatsoever and can easily get himself lost on any one way street, navigator Nami is absolutely crazy for money, cook Sanji loses his mind once he sees a lady.. and the list goes on and on. But despite these flaws, they continue fighting. For each other and with each other. If one crewmember can't do it, somebody else will be right there for support.
If you're looking for a funny, action-filled series whose main characters easily grow to your heart and feel like family: go for One Piece. You will not regret it!