The anime drags on at times, you can watch the One Pace project for a more streamlined anime experience, where stuff actually happens. Toei tends to insert flashbacks to extend the runtime too.

As for the message of One Piece, being a pirate is cool, seeking adventure is neat, friendship is great, systems of power end up abusing their population under the pretense of protection while criminalizing any form of dissent, the usual.

It's honestly great. I wasn't daunted by the length because I did like having something to watch and not having to think about what to watch(because there are always more OP episodes), but eventually you do catch up.

For good reason there is a list of filler episodes out there to know what you can skip

I like to read One Piece. I can't stand to watch it. For me the episodes I've seen are way too long with not enough happening. I saw an episode of 22m that really just covered 1 single manga chapter. In most conversions, an episode would usually be several chapters.

I hate Naruto. I finished the whole series and I cannot believe I did that to myself. The show does a great job setting up some great plot and villains, but just keep changing it. I am guessing the villains become popular and the writer just decides on a whim to make them a good guy. By the end of the show the main villain is just kind of a nobody that we have not much background in because I guess that’s the only way they could stick with having a villain.