Harem other then a few where it is not the focus or somewhat believable due to the novel setting every harem novel I have read as been at the cost of the stories quality usually so forced as well that every time a harem part comes it just kills the chapter. Also for example the MC clearly is already in love with someone else, but they force a harem to happen even though he is perfectly happy having just one girl. Seriously one of the novels I read wasn't tagged as a harem was a masterpiece at first, but 200 chapters in the harem cliches started popping up bringing the story quality down so much what makes it worse is that the MC spent the whole novel clearly in love with someone already having done amazing emotional scenes that made you attached to the relationship, but he flirts with every single girl despite having no feelings for them. The story also had almost zero romance and what it does have is so force at times that you can tell it is just done for the sake of it rather then the story.
Seriously the harem genre is one that is made to disappoint and does not go well with other genres and serious stories.