I wouldn't be surprised if there isn't already a Metroidvania thread.  I wouldn't be surprised if I made it, either.  Haha.  I'll have to look.  But yes, indie developers have given us this Metroidvania Renaissance.  It's kind of a shame, too, because it's obviously a powerful genre that gets people excited.  We can only imagine what a fully funded, major budget go at the genre would produce.  Of course, I'm not sure they'd be able to compete with what's already been released.  Maybe they're afraid to be shown up by their "lesser" counterparts.

Oh man, I love Fluidity.  I think of it more as a puzzle platformer than a Metroidvania, but there are a handful of power ups, so I guess it counts.  Any time that game can get some love, I will support it.

With all the modding and remakes out there, I'm honestly surprised no one has attempted to make Metroid 64.  I think it would be a fun idea and would be a great bridge between Super and Prime.  I don't think it would look the greatest, but I do think the color palette and tone would return to the Super Metroid roots.  The lack of this game on the N64 was the main reason I chose to skip Nintendo that generation.  If Prime hadn't released I would have skipped the Cube as well.  I'm imagining a 3D platformer, possibly with a Z-Targeting element that would allow the camera to pull back to a 2D plane for climbing tall corridors.  Has anyone seen any mods or mockups of what a Nintendo 64 based Metroid would have looked like?

It's hard to grip how an N64 Metroid game would look and feel like. I have no clue. But I would definitely try it for sure!

I'm glad to see MP ahead in this poll! MP is sublime!! The environments, the atmospheric music, tight gameplay, creepy enemies, challenging, etc..
Super Metroid could be a much better game if it had a difficulty settings. The lack of challenge on that game bothers me. Which is a damn shame, because Super Metroid has almost all the elements that make MP so good.

What's your lowest percent run?

For Which game SM or MP? 

I don't actually remember my percentage for either of the games. I usually just play through my games trying to explore everything I can, but I don't really care much about completion or anything like that. I do think though that a game should be difficult enough where you have an incentive to explore and, that is exactly where SM fails in my opinion. 

I've always thought some of the bosses could give you a run for your money, especially Phantoon.

I was referring to Super Metroid.

I would first ask if you have collected 100% yet?  That's the main objective for me for any Metroid game.  I can still remember my final percentage point. Took me weeks of searching every nook and cranny to find it.  By definition, collecting items makes you so powerful that I can undestand how you might feel the game gets too easy.  You are certainly way overpowered for the world once you have a high number of items collected. That's actually one of the joys of the game for me. My next question would be to ask what your fastest time was? That's my next objective.  I don't care about whether you're better than everyone else; this is just for your own sense of accomplishment.  And finally, what was the fewest percentage points you collected in order to beat the game?

Super Metroid, because of these stats, is a game that doesn't require an artificial difficulty selector.  You can create the difficulty on your own.  Trust me, I've been pretty good at times at Super, but I would never consider myself a pro.  The things people can do in the game is pretty amazing.  

All that being said, if you don't find joy in those metrics, then I don't want to tell you how much to enjoy the game.  I just wanted to point out that the game actually can be very difficult depending on the way you play it.  Super Metroid is probably my most favorite, because it's almost like a first love.  But Metroid Prime is a very close second.  

Metroid Prime has a hard mode, but I'm a completionist so I never thought to make any Metroid game harder by not 100% completing it. Super Metroid is my second favorite of the series after Prime, but damn is it close. Super Metroid probably actually has Prime beat on one very important aspect, though I'm not sure what you'd call that aspect. Metroidvanias have this weird sequence-breakability where not only can you sequence break, but it seems like the devs designed the game around possible sequence breaks. Super Metroid, probably more than any other game in existence honestly, does this to an almost supernatural degree. For instance, the way the morph ball bombs work allows you to get yourself out of almost any sequence break situation you get yourself into. With each key upgrade, the sequence break possibilities multiply, but none of the sequence breaks actually break the game, or allow you to get permanently stuck. That's kind of crazy, considering Metroidvanias are all about not being able to continue unless you have the right ability. Metroid Prime does this as well, but to a lesser degree, and usually it requires weird wall clipping. It's my favorite for a few reasons, largely because of the way it does plot and lore, and largely because it's just a first love for me, but I definitely recognize Super Metroid's design greatness. I don't think it needs a hard mode, because it already has rewards for fast completion in the form of the ending differences, which adds plenty of challenge.