People will always comment more on what they hate than what they like. If 100 people liked something perhaps 10 of them would leave a review, but if said 100 people hated something, 80-85 of them would absolutely leave a negative review.
NTR is just the fetish that has the most haters, but still it's just a minority, most people just ignore what they don't like since it's absolutely pointless, however I have to point it out that even those haters have different tolerances related to what they call NTR.
For example, some will hate NTR but will like netori, some would accept their harem to have sex with each other even if the MC isn't present, others would even accept NPC x NPC relationships if no main girl is in said scene (a.k.a all romantic interests of MC).
In the end it's just a question of personal tolerance and overall tolerance. Personally I'm mid level in the sense that I can perfectly play any game in which NTR isn't forced, however depending on the gameplay you may end up in a situation that while was avoidable at the start, gets to a point in which it isn't.