These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Metroid Prime
Americans Hate Tingle: The Texas-developed Prime games had a great deal of critical acclaim in America, but were poorly received in Japan. This can probably be explained by how Japan doesn't hold the FPS genre in high regard. It should also be noted that the entire series is less popular and iconic in its native land than it is among American audiences, and that it's less hatred and more apathy.
And You Thought It Would Fail: Before its release, Nintendo and Retro made so many controversial choices with the game that no one, not even levelheaded fans and critics, were kind to it. First off, Nintendo letting Retro, an unproven American studio, develop the game rather than doing it themselves. Second, making it in 3D which many expected but was still a controversial choice especially given how many franchises started to crumble with that jump the gen before it. Finally, making it first-person was thought to be the final nail in the coffin for the game having any hopes of being good and feeling like Metroid. When it came out, not only did everyone feel like it was a true Metroid game, it and its two sequels are generally considered to be among the greatest games of all time.
Anticlimax Boss: Metroid Prime itself in the first game. While the first part of the battle is quite challenging due to Prime's insanely high stamina and very prolonged length of the fight,note unless you use the Ice Spreader, which he takes a considerable amount of damage. If you're skillful enough, you hit him with it twice while he defrosts the second phase is insanely easy, as the strategy is reduced to dodging shockwaves (which don't even hurt that much), switching visors and waiting for Prime to drop a batch of Phazon so you can zap him with it, rinse and repeat. While the latter spawns Metroids to hinder you, a power bomb and/or the phazon puddle beam makes quick work of them.
When fought normally The Metroid Hatchers in Corruption are That One Boss. However, the Nova Beam and X-Ray Visor allow for one-hit kills. You'll face at least one armed with this combo, and if you're willing to wait, you can kill all three of them this way.
The final fight with Dark Samus in Echos. While no pushover, she's a Breather Boss compared to the Ing Emperor even with the time limit for the fight. Also helped that dying against her allows the player to restart after the fight the Ing Emperor but before the timer starts.
Metroid Prime Hunters. Decent portable game with a great multiplayer or a total waste?
Demonic Spiders: Chozo Ghosts in Prime. Durable, immune to everything but the Power Beam, capable of knocking out your visor with their attacks, and they spend most of the time invisible. On the bright side, the Super Missile combo works on them, and once you get the X-Ray Visor, they can be tracked when they're invisible.
Wave Troopers in the first Prime. Ice Troopers can easily be killed with the charged ice shot + missile trick, Power Troopers can be knocked around with Super Missiles, and the Plasma Beam is powerful enough to cut through Plasma Troopers. However, there's no easy way to deal with Wave Troopers; stunlocking them only works if there's one of them, the Wavebuster is Awesome, but Impractical, and regular shots are very weak. On Hard, too many Wave Troopers spawning can easily screw you over during the Omega Pirate fight.
Also from the first game, Fission Metroids. Basically much more powerful version of the standard Metroids, you can only damage them with a beam that corresponds to their color. They take a long time to kill, and when they take enough damage they split into more Fission Metroids, meaning you can end up fighting several at once. Sometimes you're better off running from these things than you are fighting them, and thankfully, you only encounter them in the Impact Crater, so they're not too hard to avoid.
Any enemy in Corruption that goes into hyper mode. You can still fight them normally, but their defense and fire power skyrockets, forcing you to initiate your own hyper mode to match their power and it also causes Cast from Hit Points, which means wasted energy tanks for a mook that had gone into hyper mode.
Ghor and Gandrayda, the other fellow hunters from Corruption, too. Of the eponymous Hunters, it is Sylux who gets the most attention, mainly to the lack of gender-specific pronouns while addressing it, as well as its Mysterious Past and ill-will towards the Galactic Federation (and Samus by proxy). The most prevalent theories are thatSylux's ship, the Delano 7, is the one that follows Samus' gunship after the credits of the third game if you get 100% items completion and that Sylux is a woman just like Ms. Aran.
The Rezbits, in spite of their irritating behavior, from Echoes as well, for being a fun enemy with a cool design and a creative attack.
Admiral Dane seems to be gaining popularity, where he is generally considered more likable than Adam. His Large Ham tendencies and being a Cool Old Guy helps. The Memetic Mutation surrounding his arrival on the Pirate homeworld and Memetic Badass that ensued as a result certainly help.
Fandom Rivalry: Had one for a while with the Halo series, due to the Console Wars and the superficial similarity of being a sci-fi FPS starring a Badass in Powered Armor. Both sides accused each other of ripping the other off. Fortunately it mostly subsided after people realized that the two series are actually really different, so there's little need for conflict.
First Installment Wins: While Metroid Prime 2 and 3 are not bad at all nor disliked, the original game is much more esteemed and acclaimed.
Fridge Brilliance/Hilarious in Hindsight: Given the events in the first Prime, there was way too little time for the Pirates to truly reverse-engineer Samus' beam weapons realistically. Then Zero Mission came out, and the sealed beam weapon turns out to be the Plasma Beam. The Pirates were working off the weapons she used during her assault on their Zebes base!
How did the Chozo manage to hide power-ups for Samus' armor on every planet she happens to visit? They were a hyper-advanced civilization who could see the future, that's how. The Prime logs tell a cohesive story about why Samus finds power-ups wherever she goes, involving ascendancy of the Chozo and their foretelling her arrival: All the upgrades and information left on Tallon IV were specifically left there for her. In Corruption, the Chozo are said to give technology to other races as gifts. Indeed, some upgrades are found in shrines and one was even near a "friendship monument" between the Chozo and Bryyonians.
The later also explains why there are so many places around the area requiring Samus' tech to navigate. The native species recieved them from the Chozo as a gift and used them themselves, naturally the one Samus finds is useful in pretty much every Chozo contacted planet she goes to.
This also explains why the Light and Dark beams in Echoes are the only energy weapons in continuity to have limited ammo: they're not Chozo weapons. In fact, they're the only beams she gets that aren't Chozo-made, or specifically designed for her current suit's architecture. The Luminoth made them, presumably using their own energy manipulation methods. Even with the transfer module, the Power Suit doesn't produce the right sort of energy to properly fuel the beams, only the charged single shot in an absolute pinch. It also explains why she doesn't have the light or dark suits, beams or visors in Corruption, they'd be situationally useful to her at best, so she left them with their creators.
Another one involving the Chozo: notice how their logs at one point mention "anyone who defiles our holy places shall know our wrath, unfettered and raw." There are a couple of possible exceptions, but those Nightmare Fuel infused Chozo ghosts show up almost exclusively in areas that were considered sacred to the Chozo. This might even imply that even in when stuck in limbo, and after having becoming quite violent, there's still something of their original selves left.
Why did Samus go to Aether again? Because the Federation received a distress signal from its marines. Why were the marines on Aether again? They were chasing a signal they intercepted from the Space Pirates. How did they intercept that signal? Dark Samus destroyed the Pirates' jamming apparatus. What does Samus do once she's on Aether? She unlocks, defeats the guardians and generally frees the way to all the most Phazon-rich areas on the planet. Echoes was an entire plot by Dark Samus to get Samus to deal with the Ing while Dark Samus just strolled right behind her and snarfed down all the Phazon it could find.
Fridge Horror: The Ing could have possessed Samus at any moment between her landing and her seizing the Energy Transfer Module. That, mixed in with Back from the Brink above, means that the Ing were defeated through sheer blind luck.
Considering this, remember that Ing Possession generally makes the host more powerful. Imagine a horde of Ing overrunning the galaxy in a fleet of hijacked Luminoth, GF, Space Pirate, and (thanks to Samus' gunship) Chozo tech. With a possessed, even stronger than usual Samus leading the army. The galaxy wouldn't stand a ghost of a chance.
Before the second Dark Samus fight (taking place on a huge tower), you can look out the window and see two Phazon crates on a ledge. After the fight, a weakened Dark Samus falls off the tower. When you come back down, the crates are gone...
Seeing Gandrayda impersonate her at the beginning of Corruption must have really scared Samus, given that the main antagonist of the game is her doppelgänger.
The Plasma Beam in the first game would be this if it wasn't for the fact that many late game enemies are immune to it. It still destroys anything you may fight before then, though. Then again, by the time you get the Plasma Beam, you've only got one new area to explore (with the gimmick of enemies having specific beam weaknesses) but a whole lot of mopping up and artifact hunting to do. You've proved you can survive these areas on way less, so the powerful beam just makes it a little less of a pain.
In Echoes, the Light Suit (completely nullifies the damaging atmosphere) and Annihilator Beam (when used with a Light Beacon or Light Crystal, it not only burns Ing creatures to ash, but actively attracts them like bugs to a bug zapper) completely destroy the threat posed by Dark Aether, to the point where it's actually safer than Light Aether.
Germans Love David Hasselhoff: Much of the Japanese series' fanbase is based in America, which might be why the 3D revival of the series was given to an American development studio.
Goddamned Bats: Among many other enemies, the titular entities certainly fall into this category, particularly in their last appearance in Metroid Prime before the final boss.
Good Bad Bugs: Apparently, the team didn't think players would try to scan the projectiles from the Omega Pirate's cannons.
This is an Elite Space Pirate.
Elite Space Pirate Description 3.
The Scan Dash, which lets you get the Space Jump as soon as you land on Tallon IV as well as an early Plasma Beam, and, when Meta-Ridley lands while his wings are still functional, a Boost Ball to the chest will ground him. These two were removed from the Player's Choice and Trilogy versions of Prime.
Padding: Aside from the Fetch Quest each game has at the end, the Crashed Pirate Frigate in Prime, which is packed with de-powered doors, each of which requires you to switch on the Thermal Visor and look for targets to shoot with the Wave Beam.
Paranoia Fuel: On your way to the seeker missiles in Prime 3, you pass through a bunch of stasis tanks his line from containing metroids, knowing full well that you may have to free them when you get the item. Helpfully, when you do release them, they try to kill you with your own genre savviness.
Player Punch: Having to kill the three other bounty hunters after they succumb to corruption.
Scrappy Level: Phendrana Drifts in Prime and Torvus Bog in Echoes count for some. The lowest level in Phazon Mines in Prime may count as well; it depends on the player's skill and how quickly it occurs to them to turn on the Thermal Visor, though it also depends if they're playing the EU version where it's impossible to avoid being damaged by the security drones. Metroid Prime Trilogy making the first two games a bit easier fixes the problem all around.
The Crashed Frigate in Prime. Irritating enemies? Check. Numerous 'door energizing' puzzles? Check. A massive water area with no warning that you need the Gravity Suit until after you fall down the Reactor Core, necessitating a long, long, long, long, long, long, LONG, LONG, LONG platforming sequence with clumsy controls just to get out? Check
Scrappy Mechanic: One-off scans. These are always irritating when searching for the fabled 100% completion, particularly when they're things you'd never expect or parts of bosses. Echoes improved things a little for bosses by telling you what percentage of the boss' scans you had, but still had a few easily-missed ones like the infamous Ing Webtrap.
Corruption and all the Trilogy rereleases carry over scans from one playthrough to the next, alleviating some of the frustration.
As far as Echoes goes, the entirety of Dark Aether can be very overwhelming: At the start of the game, Samus loses health incredibly quickly whenever she's outside a safezone, and the safezones need to be triggered manually to remain active. This causes the Dark Aether sequences to turn into a series of mad dashes from one safezone to the next, carefully waiting one run after the other so that Samus' health can regenerate between battles. Thankfully, the Dark Suit alleviates the speed at which Samus loses her health and the Light Suit stops Dark Aether from hurting her altogether, but the constant loss of health still contributes at least partially to the below-mentioned Boost Guardian's difficulty.
Also from Echoes, all beams except for the standard Power Beam require ammo. This makes it a little aggravating when enemies and boxes shot with the Dark Beam leave behind ammo for the Light Beam and vice versa. In areas like Dark Aether where pretty much every enemy is vulnerable to the Light Beam and the Dark Beam is almost useless, this can lead to huge frustration when you run out of ammo for it and can't pick up any more. The Annihilator Beam even uses up both kinds of ammo (though thankfully, enemies had a chance of dropping both kinds of ammo upon defeat with it). This mechanic was removed from Corruption and only missiles required ammunition.
Undocumented (in either the game or the manual) fact: you can shoot any of the many containers lying around with one kind of ammo and pick up some of the other. Switch ammos, hit another, repeat.
Special Effect Failure: In the original NTSC version of Prime, the Sheegoth boss is introduced in a scene that makes Samus' model invisible so it can walk out into the room impressively. This works right up until the Sheegoth tries to attack the invisible Samus while the cutscene is still going on. Obviously it didn't get the memo.
There is a mirror in one of Chozo Ruins's rooms, which has a pixelated "reflection" of Samus. In reality, it's just a barely animated pre-rendered sprite. Then again, it could have been impressive when the GC version came out, but the freedom of movement the arm cannon has in the Trilogy rerelease makes it a bit too noticeable.
Stop Helping Me!: If you have hints turned on, expect to see a reminder about where you should go next appear every few minutes if you ding around too much. Fortunately they can be turned off.
Tear Jerker: In Corruption, being forced to fight and kill your Phazon-corrupted bounty hunter friends.
That One Achievement: In Corruption, keeping all your partners alive in the escort mission can be difficult because they tends to die quickly.
That One Boss: Thardus, Omega Pirate, Spider Guardian, Mogenar... And Ridley is hardly a fair fight, in any game.
Hilariously enough, the Pirate Commander is one of the easiest bosses on lower difficulties and one of the hardest bosses on Hypermode difficulty. Worse yet, if you lose you have to do the Escort Mission over again.
Rundas throws a bunch of hard-hitting and hard-to-dodge attacks, while Samus is only at maybe 3 Energy Tanks.
That One Puzzle: A bunch. The Seeker puzzle in Echoes, the de-energized doors in Prime, and that awful rotating tower in Prime.
That One Level: New Arrival Registration and Tetra Vista sections of Celestial Archives in Metroid Prime Hunters. You have to cross it at least twice, is full of falls that only leads to certain death (what did you expect?! It's SPACE) and know what else is worse? The second time you will cross it is when you return from the boss fight, with a countdown to haunt you. Good luck for you.
The first trip through the Phazon Mines in Prime 1 is commonly called "The Gauntlet," due to the fact that it is a LONG stretch of level with no save points, filled with the new Beam Pirates. The Wave Pirates, in particular, are strong and take way too many shots to kill, and the doors lock when you face them. Compounding this are not one but TWO minibosses that must be fought, the Phazon Elite Pirate and the Sentry Drone, the latter being a VERY annoying boss that can't be locked-onto. A very hard section, that takes nearly an hour to complete, with no Save Stations. Gauntlet, indeed.
Including multiplayer for Metroid Prime 2 and making Metroid Prime Hunters focus more on multiplayer had many fans up in arms.
When Trilogy was released, it was shown that the particle effects when you charged your beam before firing was removed from the game. Word of God states that it was too buggy to make it work correctly due to the new control scheme allowing players to move the arm cannon in many angles (Primes 1 and 2 had the arm cannon move very little, which was what the particle effects were coded on). Of course, fans complained about the change.
They Wasted a Perfectly Good Plot: The eponymous hunters from Metroid Prime Hunters would have been a lot more memorable if their backstories actually had any impact on the main plot.
Samus' face in the first two Prime games was accused of this as well.
Visual Effects of Awesome: Two major ones in Prime; bright lights actually reflecting Samus face in her suit visor, and the fact that when you turn on the X-Ray visor, you can actually see the bones in Samus' arms. Not only can you see Samus' hand in Prime, but you can clearly see that her hand takes the shape of the hand symbols depicted for each Beam mode; a clever addition.
When using the Ice Beam with the Thermal Visor on, your gun is blue-red-purple instead of orange. Because its the Ice Beam. And the ice shots themselves are black. That's some hardcore cold.
Not to mention the entire Arm Cannon freezing over when you charge a shot.
The reflections of Samus' face in Prime 3 are also pretty well done, and as the game goes on her reflection changes to a point where it becomes unrecognizable.