Very much the case. Whether it was the Ely Doc Savage, the Matt Salinger Captain America (1990), or Corman's unreleased Fantastic Four (1994), there were--and are some superhero productions that were never going to live up to expectations (from a studio and/or fan perspective) or capture the best of a character. Some will need to accept that might have been the case with Batgirl.
Why would people have to accept this? We haven't seen the movie. I'm not in the habit of judging a film based on someone else's comments. And there are rumors going around that the movie was scrapped for reasons other than its quality. I'm going to be brutally frank. I believe most of the comic book films released in the past four to five years have been mediocre or just simply crap, with the exception of a few films. Very few. The idea that "Batgirl" was shelved because it might be bad is just laughable to me, considering I feel as if I have been subjected to bad or mediocre comic book movies for the past five years.