I think the issue I have with it is "Steph is Batgirl.... so what?"
I never hugely cared for her as Spoiler, where she was shown as being a fairly competent standard street level vigilante, but was quite fun as a supporting character. She differed from her contemporary, Robin, by being "unauthorised" by Batman (As Helena was sort of an "unauthorised" Nightwing).
Cass was different from any previous Batclan inductee by virtue of her being uniquely, insanely talented as a fighter. (I still say Batman approving someone who is illiterate as a Gotham protector was just a "Hell no" moment for me, but that's just me) Regardless of anything else, she could cope with just about any combat situation she was in.
Steph isn't the acrobat Dick or Babs were, isn't as smart as Tim was, and certainly isn't the fighter Cass was. She's the most, and I use the term respectfully here, "average" of the Gotham heroes. The least naturally geared and trained towards the role.
So having been a vaguely okay hero as Spoiler and a pointlessly short lived Robin, why should I care more about her as Batgirl? What does she bring to the role that makes it worth the reading? I'm not sure I see it yet, nor can I honestly say I feel inspired to check it out to find out.