So my major personal dislike isn't really about the mother. For me it sort of works with the manga and explains why the MC, Shiki, is the way he is. My major personal dislike is how they balanced the harem. Like we all know who he's gonna chose just based off of screen time and if he doesn't well then that just sucks. But come on quite literally having more than half of the manga with those two spending time together, its obvious and with how the story is going it's really easy to predict what will happen. I wish that they put more development in Akino, the semi shy gamer girl , and Rena, a senpai/neighbor who helps Shiki. In total they got maybe 10-12 chapters just spent on them together, while the rest( besides a few outliers) are focused on Fuyuki, the gal.
In my opinion should have cut out the harem tag and just make it a normal romcom. It would've been fine.