She had by far the best development out of any of TCW, starting off as quite a naive and foolish character and gradually becoming more level-headed as the series went on, eventually seeing the flaws of the Jedi and choosing to find her own way of using the Force. This and her questioning of the Order's dogma throughout the series also makes her for more human and relatable than any of the Jedi other than perhaps TCW Anakin (and even he has his prequel storyline bogging him down), with her struggling with many scenarios such as confronting the visualisation of her own doubts on Mortis or feeling a romantic connection with several characters. On top of that, she was one of the few main characters who's safety wasn't assured by the movies, hence making her adventures some of the most engaging.
This all culminates in the 2nd season of Rebels with her not only displaying her interesting stance as a Grey Jedi, but also coming to terms with Anakin's current identity and confronting him, making Twilight of the Apprentice an excellent finale to the season and her character journey. Her being saved by time travel and appearing without context at the end of Rebels was a negative, but moreso on the plot than her character.
The short answer is, she had good development and relatability and didn't make uncharacteristically dumb decisions like most prequel Jedi.
