I am currently at about the halfway point of the series and I am here to tell you if it’s worth all of the effort to watch this series.
In short: Yes, if you’re willing to commit to it.
The story starts off a bit slow and begins to pick up over time. The one problem I have is the amount of irrelevant fillers that make an appearance in episodes. I don't mind a gap between arcs because you can always skip those episodes. In recent episodes, I have had a problem with filler dialogue that doesn't really contribute to the overall story at all. Like there could be a whole episode that has half of the time dedicated to minor characters and it disrupts the flow the story.
Another thing, some of the arcs feel like they are dragged on forever. It just doesn't reach a conclusion in a reasonable fashion, which is irritating.
However, the longevity of the series can also be a positive in developing the plot. Luffy and his crew run into a lot of interesting people which allows them to make connections that later can become relevant to the plot.
For now, I have to give this series a 7/10. I don't plan on dropping this series anytime soon but if you're debating on starting this series or not, be aware that there are a lot of bumps along the road.