I don't know if I'd say this site at large hates Metroid or has a lot of concern trolls for it, but I instinctively know what you mean. Discussion about Metroid has indeed sucked here before. A lot of it seems to be over hostility towards a time where Metroid was seen as over-important and its fans were insufferable. What sucks is that as someone who got into the series in 2015, a lot of it feels like fighting an invisible punching bag. I've never seen the community being cringe in the entire time I've joined it, so I'm not sure what to do to change the perception of it when it's based off decades old discourse (and no, DKC:TF is not a Metroid community problem, the entire Nintendo community was absolutely sick of there being no big important games for the Wii U). What sucks is as a Pikmin fan, I can't even get hyped for the breakout success 4 will be because I'm already lamenting the trolling over Pikmin selling way more than Metroid
That being said, eating sour grapes about it isn't going to make things better, either. Metroid is niche and until we get a breakout game (hopefully it's Metroid Prime 4) it will continue to be so. So I just roll with the concern trolling. It is what it is.
To be frank, 2015 was right in the thick of it. Somewhere around when there were death threats over Federation Force, that seemed to be when people finally got sick of the way Metroid fans had behaved in the past few years. Specifically Metroid Prime fans, really. So by around 2017 or 2018, the narrative was now that Tropical Freeze was a masterpiece and Metroid fans are cringe wackjobs (though tbh I feel like this has mostly been forgotten now in favor of Paper Mario fans being cringe wackjobs, thanks Arlo).
It was kind of a hypocritical changing of the tides though, because you're right that everyone totally went along with the Tropical Freeze stupidity at the time, and it was only years later that it was looked back on as a Metroid fan embarassment, with no one having actually challenged the attitudes behind it that remain in vogue to this day. (But you also can't disavow it being a Metroid fan problem to begin with when the whole thing was about how it "should've been Metroid", lol c'mon.)
The deeply ironic thing about that whole debacle that I've never
once seen pointed out though is that Metroid is, itself,
a platformer. A damn good one, actually, as anyone who's played through Super after learning how to wall jump and shinespark can attest. Even Prime is very much a lot of jumping and climbing and swinging over pits to get around. It's more of a platformer than Kirby, who can just fly over everything and is mostly concerned with beating the snot out of everything in his path. Yet, because it looks marginally more realistic than other Nintendo series—and in the case of Prime is also 3D and technically nonlinear, those two are important, else you might still get no true scotsman'd like 3D World did—it apparently is exempt from being one of the "too many platformers" on Nintendo systems at the time and is actually High Art which will attract Hardcore Gamers to save the flagging Wii U instead. Trust me.
In fact, the narrative of Metroid as a total stylistic black sheep among Nintendo series is completely false. It's practically the exact intersection of Zelda and Donkey Kong Country, and there's more Metroid DNA in Wario Land of all things than you might think due to their shared staff.
Metroid and Donkey Kong Country actually have a lot in common! The original DKC team was literally two games away from making the first 3D Metroidvania when they left the series (I don't know if it was actually the first one but I'm gonna stick with calling it that because it's funny), and there's a reason Retro Studios worked on both. "Atmosphere" and "exploration" are some of the first words used to define the levels of both series. I've long been of the opinion that Retro overcorrected in the transition between Corruption and Returns, because the look and tone of the old DKC games was actually closer to Metroid than some of the bright cartoony stuff they ended up with. Kenji Yamamoto was a brilliant choice to compose for Returns, because both series use similar techniques in their music with ambient progressions,
ignoring how it didn't work out that well for unrelated reasons.
And at the same time as "should've been Metroid", Metroid and DKC fans were actually totally cool with each other over Smash Bros.! There was a sort of longstanding alliance between Ridley and K. Rool as reptilian pirate villains from 90's Nintendo games.
Meanwhile, if you want more of classic Zelda dungeon design, you are better off going to Metroid than to actual Zelda clones, and vice versa with Metroid's level design and other Metroidvanias. What Metroidvanias have you regularly
figure out how to get through a room? But it's been par for the course for ages that you can't just waltz through a room into the next in a Zelda dungeon with nothing but a few slashes of your sword at whatever's in the way. Prime areas with their puzzles built into the rooms are even more like a Zelda game.