Not at all. She did plagiarize with her fanfiction. Just because it wasn't official publishing doesn't mean it was a-okay. What pisses people off is that she never apologized, and to add insult to injury, she pulled her fanfic, rewrote it (without the stolen parts), and made loads of money off of it.

It's basically seeing someone become hugely successful by shady means. This kind of behaviour SHOULD be criticized. It's not "HP fanfic wank".