I'll be honest - fifteen minutes after I watched this episode, I completely forgot what happened. It was kind of interesting while I watched it, but after the fact, the only thing I remember is that it set things up for the next episode.
This doesn't mean it was a bad episode at all - in fact, I've liked this whole series so far. But it means that this was simply a connecting episode, one that introduced the big baddie and set up the climax, but not much more beyond that.
Compared to other villains in One Piece history, the Net-Net powers of the Amigo captain Largo are pretty dull to watch in action. On the plus side, he does provide a few chuckles when he is forced to eat some crazy things to power his nets, from boiling water to a torch. But he's mostly forgettable, which is fine because he's just an appetizer to set up the big confrontation with his boss Shiki in the movie.
Overall, this episode was mostly used to get Luffy, Sanji, and Zoro really angry before the big brawl in the next episode, which promises to be a lot of fun to watch. Tune in next week for One Piece season 10, episode 429: "A Special Presentation Related to the Movie! Decisive Battle! Luffy vs. Largo!"