Once you've played one or more NTR games it might look interesting to you when the MC is dumb, but once you've played dozens of these games you'll get tired of it because there's nothing new for you and you'll know what's going to happen.
But Kirito is one of the dumbest NTR characters to spy on Asuna and Inoda so many times and still not understand, well, you need to have talent to be so dumb and not understand what is happening. It would be much more interesting if the MC found out about the betrayal and tried to change something, there would be a confrontation between Kirito and Inoda, this could be an interesting plot twist. And so this game is a typical NTR without anything interesting where you play as a stupid character and watch how his stupid girlfriend cheats on him with a loser
. And one more thing, Inoda is the developer of this game.
Let me tell you, if Kirito found out and try to confront, inoda has no chance. you ignored the most basic background that Kirito and Asuna already have so much bond together before this story happens.
And I can see that you have played much less NTR game or read less NTR comic than me. there are 5 different ways of enjoying NTR.
1) You role in the AMC, you enjoy the dominance procedure, conduct the corruption and stealing from others.
2) You role in the MC, you feel betrayed and wanna revenge or change the situation(you are here)
3) You role in the FMC, you enjoy being dominated or pursuit the corruption, and you feel the FMC's life has improved by providing her body to random people.
4) You role in the MC again but advanced, you feel betrayed but also feel excited that you want the FMC to be corrupted.
5) You role in the Fate, everything is determined by fate, no matter what you do, what supposed to happen will happen. Then you enjoy every participant in the path from different angle.
I am currently in the 5th way in most of the time, and I can enjoy each of the 5 different ways, as long as the story in the game or comic provide enough element for me to feel those feelings.
Why I like this game so much is because this dev has provide different angle so that I can at least enjoy this game in all those 5 different ways at the same time. The only drawback I would say is that there can be more events in between some times, but given the size of the game and it's done by one person, I have nothing to complain about.