I still don't know the appeal behind Batgirl, I've read "Plucky inexperienced female superhero" before, it was the last Batgirl (who honestly shouldn't have been inexperienced), and I didn't think it was that good.
Now not only do we have Steph 2.0, but by all appearances Barbara is also completely insane, her "internal monologue boxes" often getting finished with actual sentences. Her secondary characters range from boring to "has no right to have lived this long". The dialogue in the book is execrable. The art is merely "okay" with combat that is still incredibly wooden, lousy body language, and it doesn't know what kind of tone to take. Finally: her book is generally a slap to the Jimmies of older readers.
So by all means, edify me. What makes the book so great for the legions of readers it has? Don't you dare say "fun" because that isn't fun, Atomic Robo is fun, Marvel Adventures: The Avengers was fun, Tiny Titans was fun.