TL;DR: You can't tell that this is the game that makes Mihoyo the least amount of money, there is no indication that they cut corners at all when it comes to Tears of Themis.
If you ask me, Mystic Messenger revolutionized mobile otome gaming and made it the standard to make otome gameplay include fanservice like calls, texting, etc. In my opinion, Tears of Themis is the most high quality and polished version of this template to-date (though, let's be clear, Tears of Themis is a blatant copy of Mr. Love: Queen's Choice). The game's concept is simple: you play as a lawyer that joins a secret team meant to deal with a citywide (nationwide?) crisis. Obviously, you can bang one of your teammates. But just like with Mystic Messenger, the game actually really cares about you being a lawyer, it's not just a gimmick — the game's UI and sound design are impeccable (with obvious cues from Ace Attorney, which, fun fact, they ask you if you're an Ace Attorney fan when filling out the surveys) and the art is gorgeous and never looks shoddy or out of place. The only time quality is ever lacking when it comes to Tears of Themis is the occasional obvious rushed translation job (check out Google Images for funny screencaps of garbled text). Other than that, literally everything else is above average: music, art, gameplay (there is unique gameplay attempted for every major event), story (more on this in a bit), and playability.
I would say that story-wise, Tears of Themis passes. In terms of "story content", Tears of Themis has three main categories: main story, personal stories (they're per love interest), and the individual card stories. Obviously all the spicy and romantic stuff is in the card stories but I don't really mind since it's fairly easy to accumulate SRs and SSRs over time (not so lucky if you want a specific SSR card). The personal stories, in my opinion, are overall great with the obvious exception of Marius who has a soap opera storyline that's so overdone that it feels like his route was written by a different person than the other three. The main story is not as bad as people make it out to be — it's not amazing, sure, but some chapters, especially later on, are actually compelling and worth your time. It's hard because the "theme" of Tears of Themis is supposedly the way that mental illness is ignored in society but Tears of Themis is occasionally really tone-deaf about how they handle this so some of the storylines are hard to deal with. Also, the main characters are all rich people and all of our major clients that we care about are rich people so that makes things worse.
For the gacha people, I'll be honest, I play Tears of Themis super casually so I'm not invested like some people are, but I don't think Tears of Themis is unfair if you're a casual player. I know that's kind of a bad bar to rate it by, because most gacha game players aren't casual in the sense that they desperately want a few cards, but let me explain myself: I dislike gacha games generally but can play them if I don't feel like I need to pay to actually enjoy the game. I can't stand a freemium game where you legitimately need to pay to advance at a normal rate (i.e. all the gameplay is locked behind powerful cards like in Obey Me). This is not a problem in Tears of Themis — if you don't care (i.e. you are just playing the game), you will have enough deck strength to advance through the story, guaranteed, especially since the points you get for pulling on banners can be used to level your SR cards up to five stars, which makes them basically as powerful as the SSR card you were aiming for anyway.
The very last thing I want to say is that the ongoing appeal to me of Tears of Themis, besides its interesting main story vs personal story vs card story structure, is how the game neatly splits love interests in two halves. I haven't played Mr. Love: Queen's Choice so I don't know how much Mihoyo is copying from them but I really like that Marius&Luke are the "have great chemistry with MC" routes and Artem&Vyn are the "have interesting and mature storylines" routes. It feels like you are getting a different experience with every love interest (if you aren't just there for one, which, hey the game is actually designed for that kind of player which is nice), so I don't feel like skipping solo events because I like seeing the changes in themes and dynamics.
If you ask me, Mystic Messenger revolutionized mobile otome gaming and made it the standard to make otome gameplay include fanservice like calls, texting, etc. In my opinion, Tears of Themis is the most high quality and polished version of this template to-date (though, let's be clear, Tears of Themis is a blatant copy of Mr. Love: Queen's Choice). The game's concept is simple: you play as a lawyer that joins a secret team meant to deal with a citywide (nationwide?) crisis. Obviously, you can bang one of your teammates. But just like with Mystic Messenger, the game actually really cares about you being a lawyer, it's not just a gimmick — the game's UI and sound design are impeccable (with obvious cues from Ace Attorney, which, fun fact, they ask you if you're an Ace Attorney fan when filling out the surveys) and the art is gorgeous and never looks shoddy or out of place. The only time quality is ever lacking when it comes to Tears of Themis is the occasional obvious rushed translation job (check out Google Images for funny screencaps of garbled text). Other than that, literally everything else is above average: music, art, gameplay (there is unique gameplay attempted for every major event), story (more on this in a bit), and playability.
I would say that story-wise, Tears of Themis passes. In terms of "story content", Tears of Themis has three main categories: main story, personal stories (they're per love interest), and the individual card stories. Obviously all the spicy and romantic stuff is in the card stories but I don't really mind since it's fairly easy to accumulate SRs and SSRs over time (not so lucky if you want a specific SSR card). The personal stories, in my opinion, are overall great with the obvious exception of Marius who has a soap opera storyline that's so overdone that it feels like his route was written by a different person than the other three. The main story is not as bad as people make it out to be — it's not amazing, sure, but some chapters, especially later on, are actually compelling and worth your time. It's hard because the "theme" of Tears of Themis is supposedly the way that mental illness is ignored in society but Tears of Themis is occasionally really tone-deaf about how they handle this so some of the storylines are hard to deal with. Also, the main characters are all rich people and all of our major clients that we care about are rich people so that makes things worse.
For the gacha people, I'll be honest, I play Tears of Themis super casually so I'm not invested like some people are, but I don't think Tears of Themis is unfair if you're a casual player. I know that's kind of a bad bar to rate it by, because most gacha game players aren't casual in the sense that they desperately want a few cards, but let me explain myself: I dislike gacha games generally but can play them if I don't feel like I need to pay to actually enjoy the game. I can't stand a freemium game where you legitimately need to pay to advance at a normal rate (i.e. all the gameplay is locked behind powerful cards like in Obey Me). This is not a problem in Tears of Themis — if you don't care (i.e. you are just playing the game), you will have enough deck strength to advance through the story, guaranteed, especially since the points you get for pulling on banners can be used to level your SR cards up to five stars, which makes them basically as powerful as the SSR card you were aiming for anyway.
The very last thing I want to say is that the ongoing appeal to me of Tears of Themis, besides its interesting main story vs personal story vs card story structure, is how the game neatly splits love interests in two halves. I haven't played Mr. Love: Queen's Choice so I don't know how much Mihoyo is copying from them but I really like that Marius&Luke are the "have great chemistry with MC" routes and Artem&Vyn are the "have interesting and mature storylines" routes. It feels like you are getting a different experience with every love interest (if you aren't just there for one, which, hey the game is actually designed for that kind of player which is nice), so I don't feel like skipping solo events because I like seeing the changes in themes and dynamics.