Yes or nah?: One Piece

So a lot of my friends recommend One Piece to watch but don't give me an actual reason other than saying it's super good. I'm just hoping, if anyone would please, someone give me a reason to watch it. For example, if the plot is good, the reason maybe you watched it, etc.
(Also, its no hate to One Piece or anything. I have seen an episode or two and it does look interesting, but I don't want to watch something completely without knowing if it's worth it.)