Just started and caught up with this series, 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.
Another praise I have to give is that bad situations aren't solved instantly; things like Ange's 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 his 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: Also I don't think the queen is actually romantically interested in him lol, just that she has a soft spot for him now. Still funny tho