This is all subjective I think, because we all have our own different ideas of what we consider "well-produced". For me, I don't really care how many sex scenes a game has, or how many tags it comes with. I'm one of those guys who are perfectly happy with the vanilla stuff. Personally not into the super kinky stuff, not all that into anal sex, not into sub/dom powerplay, not into humiliation. What I DO care about boils down to whether or not I can find the MC and the LIs likeable, and also whether or not the storyline grips me. And, in case the game falls short of the criteria I've set by a little bit (because this ends up happening most of the time), then whether or not the game itself is actually fun/entertaining to play also is important.
Based on those things, I have personally found the following to be of rather well-made variety:
Leap of Faith
This one is just overall really well-produced game with a great storyline, intriguing characters, impressive renders and a lovely selection of music. Still one of my all-time favourites. Love the sense of humour in this one, too.
Now & Then
This one uses Honey Select, so the animations, while still nicely done enough, have that Honey Select appearance. But I just love how engaging the story is for this game. The inclusion of extra photographic images to help us understand the worldview in this post-apocalyptic tale is also a nice touch. The music fits quite well in my opinion, too. The MC is amazing, the LIs are wonderful, and the storytelling is top-notch. That's what I think, and I'm sticking to it.
Once in a Lifetime
Just like with the above two games, Once in a Lifetime has A LOT going on. The storyline is super interesting, the music works well with the game, the characters are great (Stabby Mike!!), the humour is cleverly woven in, and there's a lot of content to be experienced. Another Honey Select based game, this one.
After the Inferno
I really liked this one when I played it last year. Interesting, medieval fantasy type story, fitting music, and overall pretty well put together in my opinion. It even has actual voice-overs during some of the animated scenes!
Bare Witness
This one impressed me when I played it. I wouldn't say the story is perfect as the witness protection programme aspect of it is downplayed in general, but aside from that, I loved playing it. The MC is likeable, the LIs (in my case MASH) are lovely, and the ending actually doesn't feel rushed. Bonus point: shares the same universe with Leap of Faith!
AlwaysFan
Yet another Honey Select situation. But damn it, I love this game! I have only done the Love Harem route (not planning on doing the domination/sharing type routes for the reasons mentioned above), but the playing experience was very enjoyable. Great characters, engaging storyline, romantic and wholesome playing experience when the Love route is chosen. And something impressive: the ending doesn't feel rushed (at least to me)!
I'll stop (for now).