Ha, Universe, heck Ranma 1/2, wishes they were that bad. (to justify the level of drama they got) Even Attack On Titans (or Worm) don't manage to get as bad. And frankly, if it wasn't for the fans the War Hammer franchise wouldn't either. But the Fate/Stay/Grand series... yeah, no. I've been exposed to enough details about its multiple continuity rehashing to know that the characters are banal as F, the story is derivative to distraction, it exalts the abusive, rapey, relationships. And it excuses the act of never getting better down to a universal law that precludes making things better even if the player/MC gets rid of a major villain/douche character. The entire thing vacillates between a porn pretending to be an ecchi, and not even hiding its a porno. It has a habit of forgetting that there was a plot, and when it remembers it tries to play it off like it's reminding the audience that there is one.
So, again, if it wasn't for the fandom, I'd only consider it a worse version of Attack On Titans. But just like War Hammer, the fans make it worse. They praise its mockery of society as ideals to aspire to, they exalt the psychological, physical, and on occasions the sexual abuse as actions to emulate. And even if they're trying to be ironic, given the sheer fervor of their adulations, I personally find it hard to believe that they don't actually believe in their praise of the actions of the depraved within the series.
But trying to tell people they need help, is unhelpful. Without any way to actually attack the problem that lets something like that appeal to those that desperately need therapy... I can only take out my disgust on the thing that enables such people to indulge their worst parts of themselves. The franchises that allow such indulgence. So yeah, my hate is less about how uninspiring the franchises are, and more about how much it encourages others to be worse than they can be if they but tried to be better people.
{Edit} Though, I suppose it's possible I've tended to encounter more the... less sociable fans of either War Hammer, or Fate etc. franchises. Which has soured my opinion of all fans of either franchises. But given how any fan of either franchise I've... had the misfortune to meet, tend to gush about how awesome either are/were; like they were utterly oblivious to the actual implications of, never mind the WoG statements regarding, the societal conditions, actions, and intentions of the setting, the characters, and organizations... I think I honestly wouldn't recognize a fan that was a well adjusted human being that didn't acknowledge that they were a fan. Largely in part because the only fans that I've met of either series, bragged about being fans of either series because of how horrible one or more components of either series was.