Eh, you're both right and wrong, OP.
I agree the bar is lower for games here (the games being free is a pretty huge reason), but that doesn't really mean anything when you're the one trying to make the game. There's a reason so many games are abandoned. It's like going to work, and most weeks you come home without a paycheck.
If you're trying to produce updates for your game every month or two so you can hopefully convince a few people to support you for a few dollars a month, well guess what? Now you have deadlines, people have expectations, and for some reason there's always a few people in your office screaming at you the second you step off the elevator demanding to know why you're dating a girl that's obviously had a boyfriend before, and why you can't just be happy corrupting your sister.
I do sometimes feel the same way OP, when I see some successful developers stop giving a shit because they're making enough money each month to finally buy that new video card for rendering that will look awesome in their new McMansion, but that's like me complaining about Youtubers getting rich. It's a tiny minority. What's impressive are the devs that keep putting out quality updates when they no longer have to.
Now, I get you're really talking about the skill involved in order to make a decent game, but you're ignoring the time sink. It's a huge factor. It takes dedication to finish a game. A lot of people simply can't do it. It's hard work, with no guarantee of any reward.
As for me, I can code and write, but I can't do graphics worth shit and don't want to have to learn an entirely new skill set. I review quite a few games here, and I agree with you that often people can do two out of the three things you mentioned decently enough. Where I disagree is that if one of them is bad, it can completely ruin an otherwise decent game.
Sure, anyone can write... but the problem is a lot of the bad writers end up here. VN game engines like Renpy make it easy for anyone to make a game, which isn't necessarily a good thing. I don't really care about spelling or grammar, or even if the author clearly isn't writing in their native language. All that shit can be fixed easily enough, often by others in the community. What I hate is playing a sex game written by some that I suspect has never actually had sex. Research that shit if you have to. I'm working on a trans game and I'm cis. If my wife or co-workers ever discovered my recent search history, there's going to be a lot of questions...
And admittedly this is a pet peeve of mine, but just the rampant misogyny in so many games that seem to be written by fourteen year old future Republicans. Try going to a bar, walk up to a woman and 'Take a closer look at those milk bags!' before following her into the bathroom so you can 'Look Closer'. Or tell her that the only way she can join your harem is if you can get her pregnant, but she'll have to help babysit your mom's new kid.
"Hey, it's just escapism dude!" Well, at least blatant racism doesn't get accepted as 'escapism' anymore.
Sorry, that got a little ranty, and maybe you also can blame the rise of the MCU movies to explain why so many game protagonists now have super powers they unleash on the world when they unzip their pants... but by far the worst (and most common) thing I see is that the story is just simply boring. This is why God made UnRen, so I can unzip the folders and head straight to the video folder if the renders are worth it. Writing is easy. Writing something decent isn't.
I don't judge graphics as harshly because I don't have a clue on how to do them, but I've played enough games that I recognize most Daz models. And I appreciate that devs want to edit a base model to make it look unique, which is awesome. What I don't understand (at least from the one art class I took in high school) is how I was led to believe that hands were always the hardest thing to get right, when it's clearly the mouth. So many fucked up mouths in games, and there's some unwritten rule that the worse it is, the more close-ups I'm going to see. And are male hair styles expensive? So many bald dudes. Mostly it's the unoriginality in graphics that bug me. Oh, you have twins in the game? Lemme guess... red hair?
But the number one thing that's probably the hardest thing to do well in a game doesn't require either writing or graphic skills. It requires common sense and restraint. There are so many games ruined by needless, horrible gameplay decisions.
When I made my first game, I added in all the things I liked in games:
Red Dead Redemption 2 is a sandbox game? I can do that!
Day and Night cycle? Done!
Mini Games? Everyone loves those!
Grinding to build up my stats? Skyrim was awesome!
Then as I started downloading and playing games here, I realized I hated that stuff in VNs. So many games here are ruined by game mechanics that simply don't need to be in the game. Don't make me scum save and try every combination of time and places just so I can finally figure out that my step sister won't talk to me again until I meet her in the laundry room Tuesday morning so I can rescue her from the clutches of a washing machine.
If I have to enable the dev console to give myself enough money to buy my landlady a vibrator that costs $1000, and I make $30 a day, you dun fucked up.
I already wear glasses, don't make me go even more blind by forcing me to hunt down a pixel that needs to be clicked before I can convince my hot college teacher that she should jeopardize her career by giving me a blow job while hiding in the lectern as I give my class report just so someone later can deliver the classic "What a great oral report!" line.
I recently uploaded my renpy save files for someone that lost theirs, and was surprised that I had 230 game files. Then I realized that I probably only finished around 50-75 of them. That's a lot of free games that I simply couldn't bother to finish because one of those three things was bad enough for me to say 'fuck it, I'm out'.
TLDR:
It's easier to make a bad game than a good, or even decent game. Mostly, because it's hard work.