kohlrak: Yeah, but other genres are easier to research. VNs, in particular, with all their stigma, are difficult, for the reason the OP mentioned, and it's because those titles defined the genres. Metroidvanias: Metroid and certain Castlevania games are ideal for this genre, as they defined the genre. These are easy to research without going crazy and just finding the bad ones. But, really, it kinda does come back to the "flight sim" thing, too, since that has the same issues. Flight sims are ill defined as well, and finding the genre defining ones are a major chore, and that's why flight sims can't get the recognition they deserve, 'cause if you go looking for them without suggestions from people deep into the genre (meaning we need more than just verified purchasers, 'cause they might be stuck on that one series), you're most likely going to find the trash.
EDIT: I think that ultimately answers the big question, then. We just need about 10 people who can verified they've played a wide variety to tell us what activates their almonds.

Spiritspawn: "We just need about 10 people who can verified they've played a wide variety to tell us what activates their almonds".
I'm sure you can very easily find 10 reviews on GOG and Steam that aren't that bad.
Yeah, but how do you tell them from the bad? Especially, like i said, you have to find people who have played a ton of these games.
If you are genuinely curious about a genre then the only real way to find out if you like it is to play it. Your Flight Sim analogy is pretty flawed to be honest as the people playing are the people that enjoy it. People that say Flight Sims are boring are either not likely to write a review, or it's going to be the typical "It was boring" review which easily spotted and disregarded. Or... Maybe they genuinely did find it boring...
Right, but as someone who has played a bunch myself, I find a dearth of decent flight sims to begin with. Something like Ace Combat is more arcadey, but people would find that enjoyable. Something like flightgear is great if you want to fly santa's sleigh beside a 747. Falcon 4 or DCS are great if you want to blow stuff up in a realistic environment. Simple Planes if you want to build one. Now, go search "flight sims" and tell me how many you'd end up going through before you got to something like them. How many are just 747 with an occasional storm simulators? I get why people are having a hard time getting into the genre.
I don't know about Microsoft Flight Simulator X, but next we have X-Plane, which i downloaded on my android, and after bouncing off the ground and flying through buildings, and finding out that the "usable panels" are light shows, and don't actually function, i completely regretted purchasing.
Next i see a kotaku article, which, for once, doesn't suck, and actually mentions some of the big boys, so that route i'm fine. But let's say i jumped on youtube.... Ok, let's say i'm a bit smarter than that 'cause it just turns into a bunch of things like Bright Side. How about we go to steam, like the average idiot. My god, some of them aren't even flight sims. First one it shows is a blimp sim, then MFSX (looks like the typical commercial sim), next is Air Conflicts, which, iirc, is one of the games that takes the worst of ace combat and mixes it with realism, Ace Combat (yay!), Bomber Crew (looks mobile to me), followed by X-Plane, and now we're getting non flight sims, including space RPGs and games that are advertising tanks and boats.
If I really want to play a Flight Sim then I'll do a quick Google search and read some reviews, I tend to read the Synopsis of the game so if it says Commercial Flight Simulator then obviously that tells me that it's not going to fast flying military jets firing guns and missiles at each other, in which case I might go for a Combat orientated game if that's what I want.
Yeah, we got lucky with the kotaku article, but only because i actually know the things mentioned in it. Most people are going to look up multiple "top 10" and/or look at steam's store. For other genres, you pretty much almost inherently know, or it takes no time at all to find a vehement fan of the genre, or people outside of the genre who've played games for more than a year could tell you.
I don't mean to sound rude at all, but really the only way you'll know is to jump in and do it. If no-one is writing the reviews you want then you probably start it yourself rather than just stating "No-one else is doing it"
Surely your own curiosity should be the biggest motivator in this. If it's not enough to get you excited to go and read reviews and browse through the hundreds of available games then I don't know if a "Good" review will make much difference.
I'm curious about Bungee Jumping.... I'm not curious enough to go and do it, hence... I probably don't really want to. And no matter how many people say to me, "It's Amazing" I still don't have the motivation to go and do it, so I probably won't.
No, bungee jumping is different. I just want to buy 1 or 2 examples of a genre and get a feel for them. Usually there's someone with a list of suggestions, and they're pretty close to the top tiers in the genre, assuming it isn't the actual top tiers. Maybe i'd like the genre, but i don't want to spend the next week playing a month's salary worth of games mixed with freebies, just to find out.