First of all, it avoids triangle drama shit. While other series stall progress in the characters relationship by adding a love triangle that won't be resolved until the series end and will poison the fanbase with toxic shipping nonsense, Tangled has a main couple already set up (from the og Tangled movie) and they slowly progress their relationship into marriage as they support each other while facing many different dangers both inside and outside.
It has some neat world building and entertaining new characters that make fun interactions with the main cast.
The original voice actors from the Tangled movie appear on this series too, along with Alan Menken doing the music (the guy that made the soundtrack for the Little Mermaid and Pocahontas) so it has movie grade music.
It can get pretty serious at times and while there're some sol episodes, the plot oriented episodes tend to go very serious very fast.
Plus, Rapunzel is allowed to grow and make mistakes. And she actually pays the consequences of the hard choices she makes rather than having it glossed over and everyone ending happy afterwards.