Man Jeff is trying to lump every Nintendo release as a "type" of game that consumers only love if they already love that shit. It a whole bunch of genres he is cramming together intentionally
Eh, I kind of agree with him. Most Nintendo IPs share a common tone. Not all, but most. Esp. if you're looking at it from the outside. And that tone will resonate with some just as it will turn off others, like Jeff. One can recognize quality and still determine that something in not for them, which is how I feel about Nintendo 1st party at this point.
Obviously if you dive deep into their catalog you'll quickly parse out the nuances that differentiate Mario 3D World from Mario Kart 8 or Super Smash Bros. But from a more cursory global view they share a similar theme, look and tone that makes them all feel similar. And that "samey" Nintendo world building will either resonate with you or it won't.
The same thing happens in all types of entertainment and enthusiast genres. The more invested one is, but more sophisticated their knowledge of the finer details. While conversely, those not invested have a generalized one-note interpretation.
I'm not into animated movies from Pixar, Dreamworks, etc. but I recognize their quality. They're simply not for me. And quite frankly, if you asked me, I'd generally say that they all look the same. But a fan would be quick to point out just how disparate Shrek is from WALL-E. And they'd be right. But the truth is that I'm not invested enough in the whole thing to care, so I just take a cursory glance at the media and make broad assumptions.
That's what we all do. No one has time to pour over every detail about every subject. Even in the microcosm of gaming there are so many sub-genres that it's difficult to keep up with them all in a learned manner. I could tell you hyper-details about the ins & outs, good & bad in the Vehicle Simulation genre. It's what I'm into. I imagine most couldn't. I'm sure Mundane Vehicle Sims look like boring s**t to most. That's okay. Not everything is going to resonate with everyone. But I do recognize that it's a wildly diverse genre in spite of looking one-note to most.
So in a roundabout way I totally get where Jeff is coming from. Nintendo's core IPs & cast generally do share similar themes and tones, esp. when we're talking Mario Universe. Sure Mario Party is different than Mario 3D World. But if you're not into the aesthetic to begin with, that won't matter too much.
I personally don't think there's anything wrong with this. If it doesn't speak to us, it doesn't speak to us. That's not a value judgement, it's simply a personal taste assessment. I think if more people understood this, there'd be far less ire in online communities.