I don't think I hate anything more than Final Fantasy. Not even the Holocaust or Avatar. The day Square-Enix stops making Final Fantasy games is the day I become so over-excited that I let demi pummel my asshole.
Because the worst part about Final Fantasy - unlike the Holocaust or Avatar - is that it will never end. There will always been another one, with the same demographic of intense geeks "frothing" for more. And it will be met with the same mixed reviews and complaints, with everyone always comparing it to the cartridge or PSX classics, but they'll take for all its faults because it satisfies some weird, carnal desire for "serios animu".
My disdain for the series is only rivaled by Triumph's hate for comic book movies.