Why Are Gamers UPSET With The Switch 2?!

Because the cost, gimmicky useless features, overpriced, expensive games, pay to play big title last Gen games with no improvements to them, a fake 120hz screen (games won't run at 120fps on this console btw), last last Gen hardware equivalent, non hall sensors for the controllers, pro 1 controller won't work, lost goes on and on.
- Good points but not all of them are correct, the Switch 1 controller does work and there are games running at 120Hz (even if it will be mostly Indie games in the future.)
  
  I have been corrected. Appreciate the knowledge homie
- I already have a steam deck, so there's another reason not to

Because ultimately, digital goods are infinite.
They would make more money on a Mario game that costs $30 with no drm then a $90 game impossible to pirate

Some of them are just fine with the switch 2 hardware and even understand that game prices have been stagnant for some time. But Nintendo has been constantly showing us they aren't a company we want to continue to support and if you couple that with affordability you're gonna have a bad time.
They're charging $90 for a game that plays better on non-oem hardware than it did on it's original intended hardware, a game a lot of fans have already bought (who would still need to pay an additional $10 fee just to get the game running the way it probably should have run from the start).
I mean this in the best possible way, but Nintendo fans are avid collectors and they want this, but Nintendo dissuades them in multiple ways from showing support.
- I have to disagree with you on the pricing point. Just because people "understand" that pricing for games has been behind other entertainment doesn't mean they are willing to stomach that increase. Most people buy video games as an impulse buy from their discretionary funds after bills have been paid. At the price point they are at currently it has stopped being impulse buys. This has led to so.many of the AAA failures of the past two console gens(current and last). When a brand new game costs $60(and gaining) and a weeks worth of groceries cost $100 you don't think in terms of "will this game be fun" but instead "will this game be worth a weeks worth of groceries. And while this isn't a problem for indies who are currently eating the lunch of the AAA pubs right in front of their faces, it will crater those legacy studios.
  
  It's a bad time for an increase economically. But when you realize that we have been paying $60 USD for games since at least the 90's and $60 in 90's money is something like $150 in 2025 money, you realize just how good we've had it for a long time. And then take into account that games have become more and more expensive to make (yeah yeah I understand that a lot of the cost is down to a lot of non-game development relevant jobs), you don't start to wonder why they didn't increase prices before?
  I'm not saying we like it. I'm saying that anyone who's given it some thought can see why they might want to increase prices.