She's isn't wrong, there's a lot of talented people who put their all behind the show (set designers, costume designers, composers, actors, sfx teams). But the final season was a poorly executed, badly written, massively rushed, mess that largely pissed away anything interesting that was built up over years, which makes it hard to appropriate the good part.
I have no interest in signing a pointless petition, but I can understand why a significant amount of people are upset and it's not as simple as "just because it didn't go the way they wanted" I don't really have too much of a problem with how it went, if executed well, with proper build and good writing I'd have probably loved it even, but it didn't.