The slice of life is fun, but the drama is just awful. None of the characters feel like real people and their reactions to things don't make sense for the scenario or world they live in. Like the first character turned traitor did so because he didn't realize there was discord between the royal family and spirits... Even though this is a very basic fact of the world they lived in! It's been two hundred years and that whole time no royal has ever used magic, the most important and powerful thing in the setting, yet somehow he does not know? Even if you came up with some excuse the series does not provide, like maybe the royals are covering it up, he is not a commoner, he is Chamberlain for the strongest noble house in the country, he would know! ...and then we get even further and it's revealed the royals themselves somehow don't know the spirits despise them, even though the events were literally only two hundred years ago and are like a defining fact of their family!
The resolutions are awful too, they just cycle in a new problem. Get rid of the royal leech and bring in your proper love interest? Oh, turns out the new love interest is shit too. That's not satisfying. That'd be like if you got to the end of Mario, beat Bowser, then the credits roll and say "unfortunately Princess Peach could not be rescued in time, and a new despotic tyrant took Bowser's place." Hello? No one wants that. If the only way you can think of to introduce new conflict is to immediately ruin any earned goodness, you're a shit author.
It's so annoying because the characters are actually decently fun and likeable, and the world is theoretically interesting, but any brief moments of respite are immediately torn back down because the author seems to think the audience wouldn't remain interested without someone to hate.
Edit: To add to that, the mc constantly plays by other people's terms even though she really has no reason to. Her and her family constantly acquiesce to the demands of the royals because... they might start nasty rumors. That might be fair in a scenario where those rumors were a threat, but you've literally got a family full of people who could destroy the country on a whim, and people far more popular than the royals (the literal hero of the country who sacrificed himself for them), and even the goddesses that everyone worship and abide by on your side. They could spread as many rumors as they like and it would mean nothing because you have the favor of the populace already, and even if you didn't, you could just kill them by sneezing in their general direction. There's no reason to engage in the constant politics and working in the rules, you literally make the rules. It's like the author was scared to ever actually have the op mc in a vulnerable position, but still desperately wants us to be convinced there are stakes.