The Metroid topic is in captivity. The forum is at peace.
Personal history: Other than learning about Samus thanks to Brawl, there was a time as a kid when my cousin started going on about games in the series. As I did with various other things he was into, I naturally followed suit and engorged myself into the series as a whole, playing each entry I could get my hands on, and consuming info on the ones I couldn't via the internet. Some years after this, the series served as my entry into romhacking/modding.
Now for my takes on the games:
Metroid 1 - Time has not been kind to it, but I do find myself enjoying it every now and then, especially in comparison to other NES games that are just arcade-style shoot-or-dies. Also I love the FDS version's door noise.
Metroid II - The big killer tends to be the lack of a map and the samey level visuals, but thanks to support from the remakes, I've been able to better explore this one and admire it more.
Super Metroid - One of the big hitters, and the first one I played, I quite enjoy the eerie, atmospheric experience it has to offer, even if the controls don't totally align with my liking. I always dread fighting Ridley though.
Fusion - Probably my most-beaten game of any kind, I've always enjoyed this one's overall vibe, and I've always liked the variety of bosses. Linearity's not gonna stop this one from being so near and dear to my heart.
Prime 1 - Does a beautiful job introducing Samus to 3D, with unmatched visuals and sound design. The recent remaster was a Godsend, too.
Zero Mission - A short but sweet retake on Metroid 1 with swift and buttery physics.
Prime 2 - Oh man, this one's where it's at for me. The epic battle between light and darkness, with challenging bosses and sprawling environments, this one got burnt into my soul as a child. The Luminoth have cool designs, too.
Prime Hunters: First Hunt - Pretty neat for a DS pack-in title honestly. Music slaps too, even if it's sampled at 11025hz.
Prime Pinball - It's a better pinball experience than Mario Pinball Land, the one Fuse Games did before it.
Prime Hunters - People like to pretend this one didn't happen, but I've always had a soft spot for it. Even if the single player is kind of a joke, it does offer some of the nonlinearity the series is known for, and the Piston Cave skip is one of the first sequence breaks I was ever able to do in a game. Multiplayer's cool too.
Prime 3 - A bit more of a slog than the first two, and the other characters are just sorta there, but it brings some neat ideas to the table. The music is also a mixed bag, but the good tracks sure are good.
Trilogy - Good thing they brought the first two to the Wii, otherwise the wait for Prime 1's remaster would've been even more painful with less of a basis for KB+M.
Other M - Disregarding the story/characters, I like how they tried doing another take on 3D Metroid, but I find this one a bit too constrained, with only the very end being more open being kind of a bummer.
Blast - Haven't actually played this one, Nintendo Land, nor have I even owned a Wii U, but I saw a video when it was new and quite admired the amusement park-esque look on the Metroid enemies.
AM2R - Including this one because it was pretty much the new Metroid game to the fandom when it launched, and I also have a history of following its development as a kid. The weird juxtaposition of ZM sounds and stock sounds isn't enough for me to shy away from this impressive take on Metroid II, even if it goes a bit too far from the original identity, and more to the traditional series vibe established after Super.
Federation Force - Disregarding the reputation gained from the time of its reveal, I think it's a pretty neat take on things, the highlight from my aborted playthrough being that boss that almost seems like Serris in 3D. It definitely gets painful midway if you're playing solo, though.
Blast Ball - I didn't actually try this one. Good to know the Federation likes to do more than just sit on their bums all day and work, telling Samus off everytime she tries to interact, though.
Samus Returns - I'm kinda mixed on this one. The new creature designs absolutely rock, but the control is a bit much for the poor little 3DS (but maybe my mistake there was buying the OG variant), and I don't really agree with certain gameplay decisions, with the melee counter coming off as forced.
Dread - The first one I played through totally unspoiled, I quite enjoyed it for the most part, even if the bosses were more on the trial-and-error-side, the story had some weirdness, and the music was a bit drab. I'd much like to see what happens after this game.
Prime 4 - My uncle who works for Nintendo got special permission to let me review this one before they reveal it for the Ultra Switch NX 64 Revolution. It's about a forbidden romance between Samus and Sylux that they have to live out without getting caught by the Federation.