First off, they're for kids yet I still see people who are adults playin em. That doesn't really make alot of sense imo.
And also the hardware Nintendou consoles are made on are inferior to that of that of PC's and other consoles which make them mechanically inferior to the competition.
PC gaming is just better as a whole but the Playstation is okay too I guess.
Dude, they're not just for kids. Seriously, they're not. That particular attitude and idea is one that I'd like to see vanish forever from the industry.
Let me give you a couple of examples.
1. Pokemon. While it's kid-friendly, honestly, pretty much ALL of the players I've met are adults. Every... single... one of them. Pokemon is a DEEP game. Deep to the point where if you really wanna get into it, it's got a bit of a nasty learning curve. The main adventure/campaign isnt too hard, but for most players, that's not the real point of it. The real point is the competition. And THAT is complicated as all hell, WAY past the point of most so-called "mature" games. Every individual creature has a bazillion stats to keep up, elemental positives and negatives, various special traits, an enormous list of possible moves, and even a list of possible items they can choose. This isnt even taking into account things like the breeding aspect, or the effects of raising them in different ways (affects their stats). On top of that, there's like 700 of them. To say that playing this series competitively is difficult is a massive understatement.
But on top of that, it's appealing in the same way that anime is appealing. Cute/cool/awesome/spooky/whatever character/monster designs are very well done. Everyone has their favorites. My own favorite is Kirlia... I even bought a plush doll of it. Went to alot of trouble to find that bloody thing. Look it up, and be surprised. But let's just say I'm not the only adult player to buy stuff like that. I go to ALOT of conventions (which are almost exclusively attended by adults) and Pokemon-related merch is probably the number 1 most common thing sold at those. For good reason.
2. Smash Bros. Again, NOT a simple game. If you go into this one thinking that it's just easy button mashing because of how it looks, well... go up against a very casual player, and you'll be fine, like in any fighter. Go against someone like me, and you'll be effortlessly erased. I wouldnt even have to pay attention, against a player that goes in with that mindset. Smash is an extremely complex and very TECHNICAL fighting game. Very fast, too, with alot of unique mechanics. And did I mention the part where there are 70 freaking characters? All VERY different? And you're expected to know what ALL of them are capable of, and how to counter each and every one. The skill ceiling is very high with this one.
Here's the interesting thing about both games: They have more depth and challenge than MOST of the so-called "mature" games. This isnt exactly a theme restricted to those two games. This is part of why I play them. But far from the only reason. I also play Smash because I like alot of the characters. Bowser, for instance, is one of my absolute favorite characters of all time. One of the most iconic.... no.... THE most iconic and well-known villain in the industry, period. And then there's characters like Ridley. Metroid is a very dark series, and Ridley is as freaky and evil as it gets. But everyone likes that guy, even if he is totally homicidal.
But also, there's one other thing to consider. I tend to think that most "mature" games, well... actually arent. Most such games just drown themselves in blood and guns and then go "LOOK HOW ADULT WE ARE". That's actually really juvenile to me. It makes me think of that sort of 10-year-old kid that sneaks into R-rated movies and does anything he can just to look like an adult, while managing to make his actions seem incredibly childish at the same time. Incidentally, most such games are also incredibly easy. I dont find this to be a coincidence.
Anyway, that's just some thoughts on the Nintendo aspect.
As for the PC part... oh yes, I agree. PCs are superior. Dramatically. But at the very same time... it doesnt matter much. Graphics and sheer power do not make the game. All that truly matters in the end is the gameplay (and for some people, things like story and characters).
What DOES matter though... and this is the reason I'm primarily a PC gamer... is the selection. PC gaming dwarfs console gaming by an utterly monstrous scale. 99% of games only hit PC. On top of that, they can do things like emulation. Truly powerful machines can do full VR as well, of the level that something like a mere PS4 cant touch. Again though, power isnt that necessary for most games now. Hell, some of my absolute all-time favorite games, such as Binding of Isaac, will run on a freaking potato.
The thing that matters even more though: Having a good time. If someone's favorite games are on the Switch or PS4, then that's what they should be playing. If someone wants to just play freaking Angry Birds all day, that's fine too. Having fun and getting enjoyment out of this hobby is what truly matters in the end.