It all depends how you play the game. Most people don't care for story and just play it for the porn, which makes sense, I play it like that too most of the time.Sadly this is not a game where nuance matters. From very early on you can tell its a "press A to follow path, press B not to". Its pretty easy if you ask me but it also makes everything super boring, like why would you NOT follow every available lewd path? IMO as much Eternum is a top notch game it still revolves around harem-making and easy relationship building. There's almost no flaws to the LIs and every single one seems okay with sharing the MC. There should be negative points where you as the player would want to say no by principle alone rather than just press yes to gain points with a character. My biggest gripe is how Nancy is more than okay sharing her own daughters and have an orgy just like that, how every single LIs likes the MC and its implied even masturbated to him in month span-time. There's no drama aside from the actual story, and I'm more interested on it than the relationship building.
The only good written character as of now its probably Luna, maybe Nova too. As for the household, I have no interest whatsoever in none of them, but I'll follow ever single path because there will obviously be no consequences.
But since this is one of the best games in the genre, people want more from it. That's just what happens with good games. A lot of people installed the game for the porn and stayed for the story and the characters. And the character path system and choice system can definitely be improved, at least for future games Caribdis makes.