Wrote this in the chapter comments but I figured I'd add it here in case anyone was wondering whether to start reading the series:
Just started and caught up with this series [as of chapter 23], and I gotta say it's much better than I expected. While I never liked isekai harems with overpowered MCs, this does a great job giving the main characters actual personalities with depth - both the girls and the other guys. Also since the world is more governed by politics than violence, MC's OPness oftentimes works to his disadvantage. He's also a decent guy underneath the heel persona, it always bothered me how easily some MCs killed people. Finally, him not seeing the girls as possible romantic partners also gives their interactions a real genuineness, since the story doesn't treat them as objects to be seduced. It's a character driven story so it take a couple chapters to get off the ground, but when it does it's extremely enjoyable.
Another praise I have to give is that bad situations aren't solved instantly; things like Ange's feelings about the Prince, or her treatment of commoners and Olivia's subsequent depression is taking multiple chapters of personal reflection to address - and even then they haven't been able to make up yet. It makes the problems feel like real problems.
I haven't read the source material, but moving forward I'd like him to continue being a mentor/catalyst for the other characters to grow, maybe even taking a backseat role to do so. Also despite Marie who is definitely sister being a bit of a jerk, I think they genuinely cared about each other in their previous life and I hope we get to see them interact with each other more often. I could see them having a really fun comedic rivalry.
Edit: Holy cow, I just realized - there's a lot of similarities that this otome game has with Fire Emblem lolll