I might have to check this shyt out.. I've been out of anime for a while...What are the best aspects of the series?
-Creativity. The powers that are given to characters and how they are used in battles are interesting.
-World building. The series has one of the best worlds I've seen in an anime/manga. The unique locations play a role, but the best part is it's rich history, especially the unknown history that gives the series more depth.
-Character interaction between the main characters
-Callbacks. There are a lot characters and situations that are given small apperances in early arcs that wind up playing a key role in future arcs.
-Humor. This depends on what kind of humor you like, but One Piece tends to be very juvenile and over the top. If you like that kind of thing you'll enjoy this.
-Music. When it comes to the anime, the One Piece music is probably the best in shonen anime. Battle themes, emotional themes, dramatic themes, all top notch.
Basically, if you enjoy works that focus on adventure, tends to be more lighthearted but can provide strong dramatic moments, have no problem with over the top character designs/situations/action scenes, and can make fun of itself, you should be able to enjoy this.