I'm going to be honest, given this information I'm wondering how you know you hate them. Any individual recommendation is likely low-quality, but that's mostly thanks to Sturgeon's law - Steam certainly has a good enough grasp of what I'm looking for in a game to point me at the right genres.
You would be right of course, but thats not the point. It's not harming anybody, and nobody has to use such a feature.
If you want more specifics: You complained about VNs as being "anime" and then said that all anime was about high schoolers. I provided recommendations for high-quality VNs that were neither anime nor about high school.
Some recs in that direction, based on what's presumably a collection of western RPGs and FPS games: Baten Kaitos (gamecube), Most Final Fantasy games in the single digits, Golden Sun I and II (gameboy advance), Umineko (PC), Steins;Gate (PC).
My guess is that because those games are so inexpensive, they probably sell a ton of units irrespective of price and category, and if the system is optimized to show stuff that is moving a lot of units in a short period of time, it will bubble to the top.
The other day, the only good recommendation I've seen in a long time came up: Battle Brothers has a new DLC, even long after the devs said they were not going to make any. But that's the only one I can really think of.
I think most personalization features on marketplaces are kind of overrated. I care way, way, way more about sales than I care about 'personalization.' I am just about never going to buy something at full retail apart from daily essentials.
I think his problem more realistically is that his category is extremely weird. Adventure solitaire RPG? How would you even begin to SEO that product page in a way that didn't cause a ton of confusion?
Even something like Thronebreaker, which is basically a solo player card game RPG, does not try to distinguish itself on search. It promotes itself based on the strength of the Witcher brand and on Gwent.