NTR doesn't destroy anything, the previous content you enjoyed is still here, in the case of my game you just failed at playing...
For now the game don't have NTR, was the game good for you ?
Some of your choice may lead to NTR later in the game, so this will be the worst 'Game Over' for you, a ending with a real meaning ! think about it.(as a player and dev it please me.)
Frustation is the part of great games, without it there is no achievement.
I'm not into NTR either you know... But for exemple Berserk is a worldwide praised manga, his most 'strong' moment is kinda a NTR scene, and even if i don't like NTR this doesn't make Berserk a bad manga at all, it's even the opposite.