I have mentioned this several times in the past but I wasn't really a fan of Simone's run on Batgirl. Is not only because of the overly-dark (and apparently mandated) direction her stories took, the problem is that her stories were simply not really well-written. Many of her writing ticks started to become quite evident here like the overly-forced dialogue that at times tried too hard be funny, overwritten narration and her own insistence of making Barbara's character completely dependant on the Killing Joke by including villains being created solely to support such theme and several flashbacks to the event (the worst being the one she got in her cameo during Simone's The Movement series which was a completely different book). Babs barely had any personality beyond that during Simone's tenure.
This is the reason why I liked Stewart/Fletcher/Tarr's run so much. The first thing they did was make Babs overcome all of her previous traumas and move forward, the lighthearted tone along with Tarr's gorgeous artwork were also welcomed after the last dark era.
To be honest, I'm not a really a fan of Larson's work so far. Is just decent at best since her stories nor characterization are particularly engaging, the opening arc was pretty forgettable in fact despite that it introduced a lot of characters and villains (None of them were really memorable). The best part of the series is Albuquerque's artwork but even him is not enough to make the book great.
I hope that Batgirl receives a new and interesting direction one way or another soon since there's a lot of potential for new stories starring her.