Feel so bad for Next Level Games right now. They were riding so high after Luigi's Mansion,only to come crashing down with one disastrous game reveal. Sadly, what we saw of this game not only bears none of the hallmarks of the Metroid series, it has none of the hallmarks of a Next Level Game either! Most Next Level Games are filled with life and expressiveness. They imbue so much character and charm into their games even when they are simple arcade sports titles. But MP:FF seems to have none of that. It's like someone told the devs that sterility was the key component in a Metroid title and to make sure that this game has it in spades. I wouldn't really even card about the stunty art style if it came along with some expressive and interesting character quirks or something, but instead you get a bunch of bland, odd looking robots lumbering around shooting crap. That's entirely the sort of game Nintendo fans have been not wanting to play on other platforms for years, but not even a good version of it.
The word to describe this game's development and announcement really is tone deaf. It comes across as if Nintendo has no concern for or understanding of what its fanbase likes about its franchises. I'm not overly mad about this announcement or anything. I even understand Nitnendo's desire to do something different with a handheld version of Metroid. Hell, I am even still likely to buy this game. What I don't understand, however, is how Nintendo could have been so blind as to think that announcing this on its own was anything other than a horrendous idea. It sounds apparent that a console Metroid title is in development. If that's the case, why send this game off to die by announcing it as the lone new Metroid title in 5+ years? Just show off the bigger title as well. Reassure your fans that you understand why they are your fans and want to continue making the same sorts of games that earned their fandom in the first place.
I don't actually take this to mean the Metroid fanbase is overly toxic as someone mentioned earlier. Rather, they are rabid for a great game in the franchise to evoke the familiar feelings of isolation, discovery, tension, and power development that come with a great Metroid title. I could see a new Metroid game that deviates in huge ways from previous iterations of the franchise, but still gets received well by fans due to retaining these core tenets. Unfortunately, none of that is on display here, and I think people are right to be disappointed about that.