I didn't know that in "Scar of Summer" the MC deserved what he got. But I felt bad for the girl he loves and for his sister.
It's true that in a lot of Eroge games, not just NTR, the MC characters are too nice and let themselves be done too much, whereas they're powerful enough to impose their point of view... in my opinion, that's what's most frustrating about this kind of game... the powerlessness of MCs in the face of their friends, who have no qualms about hurting us without us being able to react.
Today, I played a game called "Engraved Pleasure", which disappointed me greatly, despite the pretty graphics and friendly FMC.
You play as Robert, the prince of the Kingdom of Corinth, who has promised Arieno, the only daughter of a farmer in his territory,
that he would enroll with her in a military academy in two years' time.
However, shortly after making this promise, she disappeared, and two years later, as Robert was about to go to the military academy, Arieno, now his servant, reappeared and was waiting for him.
The MC wonders why Arieno suddenly disappeared, and what happened during those two blank years? Yet she doesn't want him to know, so it's inevitable that she's hiding a big secret, which Robert will discover when he's assigned to the military academy.
The frustrating thing about this game is that the others who discover her secret before we do will use it to blackmail poor Arieno, and if the MC doesn't find a solution to her problem, she'll end up with one of the two villains of the story.
The problem with this kind of game is that the story leaves a feeling of déjà-vu if I have to play an NTR game, I prefer to play games like "Slice of Live" or "President Yukino", because they offer several possible scenarios and endings, and corruption is really interesting in these games.
The worst NTR game that really hurt me was this one I bought on DLSite, and I really regret playing it because to this day, just seeing it or talking about it makes my heart ache...
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By the way, I left the first negative review, asking the creators to create a positive alternative ending, because it's shameful to let a story end like that... it's a demoralizing and depressing game.