These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Batgirl 2000
Base Breaker: She's either awesome, or an overrated Mary Sue. As seen below.
Ensemble Darkhorse: She got her own series. That says as much. Similarly, frequent guest star Spoiler gained quite a following.
Fandom Rivalry: It seems that a lot of Cass's most vocal fandom despisesStephanie Brown and her fans, due to Steph replacing Cass as Batgirl. Its lead to accusations of racism on the part of Steph fans for preferring Steph over Cass, or for caring more about Stephanie's misfortunes than Cass', even if they make it clear they like Cass as well and take time to mention Cass's troubles as wellnote In fact, some use this as a basis for the racism accusation; apparently, they only take time to give a token mention of Cass to avoid looking racist. Apparently, the only difference between the two is their racenote ignoring their different personalities and dynamics or skill level that can play a part in their reason for preferring one to the other, and so the only reason to like Steph more than Cass is because she's white.
Replacement Scrappy: Cass received this at first, and still runs into it from time to time. Due to her popularity, it also lead to Steph getting this when she became the new Batgirl.
It's not just that she's being compared to Barbara. It's also that she replaced the mysterious Batgirl who was introduced earlier in Batman: No Man's Land. The reveal of that Batgirl as Huntress and her sudden loss of the costume to Cassandra was very abrupt.