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: Monster Hunter
Accidental Innuendo: The description for the Dios Katana says it can "pierce foes and detonate inside them."
Anticlimax Boss: Ceadeus, to most. While its attacks are fairly damaging and difficult to dodge if you're close to it, especially without the Lagiacrus armor, you pretty much can't fail against it unless you faint three times. Upon hitting the seemingly narrow time limit of 30 minutes, it flees and you get some materials. You are then free to take the quest over and over until you've completely whittled down its health.
Same can be said about Fatalis, Akantor and Ukanlos. Once you learn their patterns, they become a lot easier. They still hurt you a ton if you're not careful.
The two kings of this trope are probably Lao Shan Lung and Yamatsukami, both of whom are even more predictable than the above. Lao doesn't even have a move that targets players on the ground, whilst virtually every one of Yama's attacks is clearly telegraphed and easily avoidable even if you have the reaction time of a dead cow.
The Ivory Lagiacrus in Tri Ultimate is hyped up pretty heavily in game, being the monster that eventually forced the Village Chief into retirement from his hunting career and all, and is also the last fight before the credits sequence. In practice, however, it's a slightly stronger Lagiacrus who has roughly the same (or, in some occasions, less) health as most of the fights leading up to it, fights nearly entirely on land (generally considered to be easier than fighting them in water), and whose only real additional threats compared to the normal Lagaicrus are slightly wider hitboxes on its electric attacks and slightly increased damage.
Barring monsters with dodgy hitboxes or unstable animations, any fight can be mastered due to each beast's well defined behavior. Unfortunately even in offline mode most players will have to run them until they become easy if they want to craft good equipment.
Cult Classic: A strange example because even though in Japan these games are easily considered a Killer App and very popular, internationally, it is much less popular overall but the fandom of it still very much love the games. This is one of the main reasons that half of the games are not released outside Japan.
8.8: Yahtzee's review of Tri sparked an edit war on the ZP Dethroning Moment page and a Hiroshima's worth of backdraft across the internet.
Things got worse when he talked about the game in his "Extra Punctuation" column the following week, in which he announced that he had stopped after the Great Jaggi fight. Said fight is occasionally considered by the community to be the unofficial end of the tutorial for Tri, which certainly did not reflect well on him in their eyes.
Fan Dumb: Need help taking a certain hunt? To most veterans you're the scourge of the earth and you don't deserve to play it. Some people also get very opinionated about certain weapon classes.
Game Breaker: Hammers in Tri, attack twice then windup charge, then attack immediately after you go into charge mode; then repeat, you attack as fast as Sword and Shield.
The Slime element introduced in Monster Hunter 3 Ultimate, which throws the balance of the game out the window, making the other elements obsolete. The Kelbi Bow, with the Awaken skill which unlocks its Slime element, is becoming infamous because of this, thanks to its level 1 charge spreadshot (5 shots), allowing it to inflict the Slime element quickly and easily For Massive Damage. And that's before you apply bonuses from Bomber skill. Granted, monsters will gradually increase their resistance against Slime elements (like any other status attacks), and farming Brachydios is not easy, but Slime's utility is so huge that it pales other elements in comparison.
Goddamn Bats: Quite a few of them. "STUPID VESPOIDS!" and "STUPID BULLFANGOS!" is practically a catch phrase to some hunters.
Maybe subjective, but just about EVERY non-boss (read: not the quest target) monster is a god damned bat. Doubly so if you're using a long-range weapon, which tend to rarely be able to kill them in one hit - important when you've got a giant wyvern breathing fire down your pants.
Tri adds Goddamned Rhenoplos to the mix. Basically they're a mashup of a Bullfango and an Apceros - they share the Bullfango's love for charging but knock you even further, and they have health about equivalent to an Apceros. Add in armored craniums that can deflect frontal attacks of even green sharpness and you've got one annoying enemy.
For that matter, Tri also adds Bnahabras, souped up Vespoids. While Vespoids were annoying for sneaking up on you then leaving you vulnerable to attack by a paralyzing sting, Bnahabras add in the ability to shoot a defense-lowering goop at your hunter, making everything else hurt more.
Hell Is That Noise: Some wyverns can produce utterly otherworldly roars, take Diablos, Khezu or Gigginox, for example.
Internet Backdraft When news that Monster Hunter Tri was going to be a Wii-exclusive, the 360 and PS3 fans did not take it well.
When fans found out that not only is the Updated Rerelease of Tri exclusive to the Nintendo 3DS, but the upcoming sequel as well, fans weren't amused.
In a less Console Wars-based example, the fact that the 3DS version of Monster Hunter 3 Ultimate has no online multiplayer, being limited to local multiplayer, made some people bitter, especially considering that Monster Hunter 4, which will be released on the 3DS too, will offer online multiplayer. The Wii U version of the game will allow online multiplayer, though.
Les Yay: The female owner of the item shop in Tri REALLY likes hunters, even if you choose to play as a female. At one point she will even crack a joke about accepting a lock of your hair for an expensive item.
Squick: The most common reaction to Khezu and his cousin Gigginox. Even the Japanese title of Gigginox translates to "creepy".
That One Boss: Varies, but Tigrex for most. Very fast, massive range, massive damage. These all increase in Rage mode. Compared to other bosses leading up to it, Tigrex represents a massive spike in the difficulty. Portable 3rd gives us a Black Tigrex which is basically an even faster and stronger version of the original. Another frequent candidate is Rathalos, especially from Tri onward since he spends much more time flying just out of reach for most bladed weapons.
Also in Unite, the Nargacuga. A souped-up Tigrex who can shoot tail spikes. Or worse, a Tail Slam that can send you back to the camp in one hit.
Green Narga from P3rd is able to do said Tail Slam TWICE in a row. Its spikes will now paralyze you.
And 3 Ultimate gives us a rare species of Nargacuga, which can turn invisible during the fight, and its spikes are now poisonous and can shoot them anytime after it uses its tail for an attack.
Also, Khezu. It lulls you into a false sense of security with its slow movements and easily telegraphed attack patterns, but its got a metric fuckton of health, is ridiculously resistant to damage (don't bother trying to attack it unless your weapon's sharpness is in the green), and once you finally do get its health low, it busts out the most devastating enraged mode you've seen up to this point, utilizing a new lightning charge attack that can easily One-Hit KO you and its attacks become much more quick and unpredictable. Made so much worse when fighting it near Snowy Mountain's ledges.
White Monoblos. Not the normal one. The White one. Why? He has more health than his cousin, and he runs away every 5 freaking minutes. Also, he hides in the ground every 10 seconds, rendering him invincible unless you carry the maximum number of Sonic Bombs, which is 10. And it's not enough. Best thing? With the best Sharpness you could afford at first, the only part you could attack properly was his tail and his horn... both of which snap off after only a few hits.
Rajang. Has all the elements of speed and unpredictability of a Blangonga, the roar knocks you away, and it fires LIGHTNING BEAMS and THUNDER BALLS (both are actually non-elemental) from the mouth. Once it's enraged and becomes Super-Saiyan... Well good luck not to be hit by its attacks or risk One-hit KO. Unite gives us a type of Rajang that is ALWAYS IN RAGE MODE, and another rage mode upon that (though actually slower). Worse, the best Thunder-element weapons (to deal with Tigrex, for example) can only be made with some Rajang materials...
The lesser mentioned One-Horned Diablos, aka Devil Diablos. It looks like any other Diablos, just slightly bigger and with a broken horn but it's actually a rank above what you're capable of fighting when you can first battle it, which means it hits a lot harder and has a lot more hp and, of course, the game doesn't give you any kind of warning as to what you're in for. You also get the usual items and only a slightly higher reward for defeating it.
Tri gives us Rathalos (which has been turned from a nonissue in Unite into a genuine That One Boss thanks to a combination of newfound speed and maneuverability and harder access to weapons fit for fighting him) and Barioth, who is basically Nargacuga but stronger, and who exchanges the ability to shoot tail spikes for being able to spit twisters at you. Twisters that freeze you solid.
Rathalos and Barioth are especially frustrating because of the low availability of fire and dragon weapons early on. Rathalos goes down rather quickly with an upgraded Rusted Weapon with the Dragon element, which can be mined at a very low chance from the Volcano. Barioth is much easier to deal with with a good fire damage dealing weapon. The catch? Most fire-based weapons require Rathalos parts and upgrading a Rusted Weapon requires Frost Sacs from Barioth. Pick your poison.
Chameleos. Probably the most irritating enemy in the series simply because it is invisible for maybe 90% of the time you fight it. It also tends to go back into stealth within 10 seconds of bringing it out of stealth and, all in all, a huge pain in a the ass.
Go online and try to engage a high-rank Qurupeco. It can summon the Great Jaggi, or the Rathian. It can also summon Deviljho, who is just as bad as he sounds. Many a Qurupeco quest has ended because it summoned G.I. Jho.
Just like Capcom to not know that everyone hates Deviljho, in 3 Ultimate we got a unique Deviljho roaming around in normal quests... And it's always in rage mode. Want to run away from that? You HAVE to farm them because they contain a unique type of carve to make good stuff with. Have fun.
Portable 3rd gives us a new monster: Zinogre, which looks easy in its normal state, until it starts to charge up 3 times... And it goes into Hyper Electrified mode. Basically speaking, it IS its rage mode which will not stop until you make it fall down, which means it can stay in this form much longer than others' rage mode. In this state its speed and power rockets to crazy levels, has attacks to make you more vulnerable to thunder-element attacks and fainting, and has a ridiculous hitbox for its attacks. Oh and the paralyzing trap you were using all along? It's IMMUNE to that in that state, and at other times the trap WILL help it to charge up. Also, it can go into rage mode... while already in this mode. Which makes it a Double Rage Mode.
3 Ultimate gives us subspecies of Zinogre, which can rain down dragon-element thunderbolts while charging up, and is able to launch homing thunder balls at you. And they're fast.
A new contender of That One Boss arrives in 3 Ultimate: Brachydios, which also known as "the most powerful package monster" throughout the series, fans and developers alike. Given that Tigrex was so feared even among veteran hunters, this should tell you something. It's very fast and agile, its punch (yes, it's arms are developed enough for this) will leave what amounts to green napalm on you, and if you don't roll for a while to rub it off, the slime will explode and do huge damage; said slime will also explode if you're being hit by Brachydios' attacks. And unlike its fellow wyverns, Brachydios actually uses a different moveset from others like Deviljho (despite being identified as the same wyvern family), it takes some time for even old hunters to avoid being hit, such as its jump attack which lead to deaths of many hunters. Once it goes berserk it'll start using wide-area explosions, doing attack combos along with its increased speed. Inexperienced hunters are actually adviced to run away instead of attacking it. Of course, beating it will allow you to create new weapons with a Slime element, making other fights considerably easier, if only one can consistently beat this monster, that is.
That One Attack: Almost every monster has at least one, if not more. Some examples:
Khezu: Roar during rage and either a thunder tackle or thunder ball shot. Roar will incapacitate you unless you defend or have High Earplugs. Either scenario inevitably results in a KO in solo.
The main problem with Khezu is that they are unique in having no eyes, so they can't technically see you and thus cannot give you the "spotted" status, and you can only do panic dives (that render you invincible; which regular dodge rolls don't do) in this state. Dodging its attacks at the last second is a no-go as a result.
Gravios: Roar and heat beam. Same as above. High and G-rank one-up this and give the Gravios' a sweeping heat beam.
Plesioth: Hip-check. HUGE range, fast and with an absurd hit-box (as in, no part of the Plesioth can touch you and you will still get hit).
Rathian: POISONTAILBACKFLIP! For the beginner, this attack is devastating if you are not used to it. It comes out quickly and with little warning, it has high knockback, and poisons you as well. Luckily, if you have the poison-negating Wroggi Armor, or can just dodge well, it's much less threatening.
The Pink Rathian's version is even worse, as it can use a hovering maneuver to position itself right next to you, then immediately backflip. Problem is, it's virtually impossible to tell where the attack will come from, making blocking or evading it very difficult.
Rathalos: High-dive claw attack. Comes almost out of nowhere to the inattentive player and is just as impossibly hard to dodge. Fortunately, a running dive can evade it (you need to see it aiming itself at you first, though, which is the big problem) or you can block it (yes, even with the Sword and Shield!). Failure means you will be poisoned and likely stunned - on top of the huge damage!
There is also a sudden fire attack it will do when it suddenly flaps its wings and shoots a burst of flame at you while jumping backwards. There is absolutely no warning, blocking it is difficult, it can turn left or right (meaning it can still hit you if you're attacking it from the side), and it inflicts Fireblight, which can be just as bad as poison. It also sends you flying, and Rathalos jumps backwards as he uses it, so he can now get a free fireball shot at you.
The Deviljho's breath attack (Inflicts huge damage and Dragonblight).
Pearl Espinas: The Firestorm. It essentially flies up and nukes the battle area, spreading unblockable, poisonous flames around it. Get hit by that, and you have a few seconds before it sends out a shock wave clearing everything around it. And it's the main attack this thing uses. Made worse by the fact that making it flinch during the few second gap where it's preparing to jump is the only way to get a much-needed item from it.
Nargacuga's Tail Slam. It's basically a close range, spammable One-Hit Kill that can be frustratingly hard to roll through and has a kinda iffy hitbox (you take full damage even if you touch the dust cloud it raises after the tail touches the ground). Granted, you can see it coming from a mile away (he roars very noticeably before doing it), but not even Evade+2 can bypass it.
Qurupeco's monster calls. If you don't have dung bombs, this turns a one-on-one fight with a relatively easy monster into a two-on-one with anything from the relatively easy to manage Great Jaggi or Rhenoplos to the crap-your-pants scary Rathalos, Diablos or Deviljho. It can then boost their attack, defense and even heal them with other calls, as well as itself.
Uragaan's mighty seismic chin can count if you aren't watchful. It will blow up any rocks thrown by its tail swing, meaning that if you didn't pay attention you have a chance of flying through the air right now, and it's actual damage and flinch radius are questionable until you've faced it enough. Note that the flinch radius will force you to put away your weapon, meaning that you have to draw it again and it just ruined any charge you had going.
Also the roar, while not annoying, is followed directly by an attack in front, meaning that you need a certain skill or you have no way of avoiding it if you were in front.
Brachydios's leap slam, especially when enraged. It does a LOT of damage, is difficult to evade, has a wide area of effect when in rage mode, causes Slimeblight, and usually comes out of nowhere as the tell happens only a split second before it goes airborne. And sometimes it skips the tell and jumps without warning.
Tri Ultimate brings us "Sticky Situation", the Urgent Quest for Hunter Rank 6. Brachydios is already considered to be That One Boss on its own; however, Sticky Situation throws TWO of them at you at once, and the G-Rank variants of them, no less. While this is already bad enough, the fact that the fight takes place in the Tundra makes it worse as roughly half of the map is inaccessible to either Brachydios, which means that they will be crossing paths frequently, even if you chase them off with Dung Bombs. This is particularly frustrating because Brachydios are highly dependent on Splash Damage, ensuring that any crossfire between the two ensures that you'll be treading through a minefield, especially if one (or both) become enraged. And to put the cherry on it, one of the Brachydios is bigger than usual, which means that it's even harder to evade the nearly ceaseless barrage of attacks. Also,unless you can find a group who has already surpassed it and can help you grind higher rank G-Rank quests, it's not like the gear you'll have the first time you'll do this quest will be all that strong for this, either.
Unfortunate Implications: The black furred felynes are the only ones who are outright hostile and attempt to steal your stuff all the time, while the white furred felynes are pretty nice until someone smacks one. However, there's also friendly "black furred Felyne"/Melynx in villages and cities. By the same logic, you could said that all light colored felynes are ready to snap and blow themselves along with you at the slightest provocation, even if you're not the ones who provoked them in the first place.
Waggle: One of the more heavily criticized changes in Tri, despite the inclusion of a more conventional control scheme.
Woolseyism: The subspecies of a monster in the Japanese versions usually just has subspecies in its name, but the localizations add colors to their names in order to make them more unique.