I like it, but dang- I was expecting just a fun punk rock movie, but instead got a movie that gets pretty dark and serious. And that ending nearly ruins it for me, but... well, all in all, it does still have a fun punk rock feel about it, so I can't hate it on the whole.
Worth noting is that the film's star, Gina Gershon was coached by real-life Rock star Joan Jett on how to properly play electric guitar, and if you really pay attention, you can see Joan's influence in her stance and mannerisms as-well. Also, the tie/rope necklace Gina wears throughout the film was given to her by Joan. That said, Gina's way of talking and other things about her say more Chrissie Hynde of The Pretenders to me (the Rock star Gina herself says she relates to more, in real life). All in all, it seems she basically channels a combo of the two.
The whole film is well-made and casted, and if it weren't for how depressing it gets, I would like it a lot more than I do, but I still like it. Besides, one thing a lot of people don't seem to realize is that this movie is loosely based on the real-life impressions and recollections of a woman named Cheri Lovedog during her time working in and around the music scene. And she who actually wrote the story for the film (so no, not based on Joan Jett as some of her fans joke). Thus, I guess the dark details needed to be in there for authenticity.
FYI- my girl Joan Jett was supposed to make an appearance in this film AND the guitar parts in the songs were supposed to be done by her on the soundtrack, but financial issues and disagreements between Joan's team and the movie's team meant that Joan dropped out and the idea for her cameo was abandoned, and her guitar parts replaced. Too bad too, cause there're some good songs in this movie.