Voted for everyone except Sakura.
I apologize to the Sakura fans out there, but Sakura is the sole f/sn character that irritates me.
EDIT:
I didn't really hate Zouken after HF and Fate/Zero. I'm more like indifferent to every villain in any work. I mean come on, hating a fictional character? I understand if you dislike a character, but loathe a non-existing person will all your heart?
And you're forgetting the reason he's prolonging his life in the first place. He started with a pure wish (world peace and shit), but the real world crushed him yet he was stubborn about it and sought immortality and in the end his wish deteriorated and he forgot what he was doing in the first place, lol.
Ironically, he suffered several times more than Sakura ever did.
You just summed up the feelings of a large portion of the Illya fans. Seriously though, they should rewrite HF and scrap Sakura off in a similar way like in Fate n UBW or just kill her early on. We could then have the Illya/Archer route. As for the brother/sister thing, thankfully we have Fate/Kaleid Liner Prisma Illya which is an example of how awesome an Illya route would have been. HF was wasted on Sakura honestly.
Too brutal? More like complete and utter crap. Sure, I felt sorry for her when it was first mentioned she was raped.
But then the dick worms came in, followed by poisoning, followed by Shinji abuse, followed by 'lol imma gonna kill u' talk, followed by Angra corruption, followed by the 'So what?' talk by her sister.
Everything else was fine. I think another reason I came to dislike her was because of how she mops in her normal end. Others would see it as her unending devotion to wait for some who would never return but nonetheless, she threw her life away after finally being free from the shit she's been through and that pissed me off.
/rant