I didn't read the manga, but, I think one piece is not for me. I agree with the part that it might be for kiddies, but it sucks for me. Maybe it really is a good anime and I'm not giving it a chance...but jeez, I really can't stand watching another episode of it beyond the sixth one. "Convert the Weak, Purge the Wicked, Honor the Righteous."
If you are a fan of the show, DO NOT WATCH THE DUBS. 4Kids actually took out entire story arcs, and did too much editing. One of many shows that i deem "Dubbed to death".
One Piece is a great anime. Personally, it's my favorite. But don´t look at the dubbed ones, i got lucky and found a site where you can get them subbed and since then i've been watching and enjoying it. Getting close to the 90:th episode now and still loving it.
My favorite characters is also Luffy, Chopper and Usopp. The Arabasta arc was really good, but that was not very surprising since it is an awesome animé.