YMMV / Metal Slug

  • Accidental Innuendo: Some games introduce the option to tone down the Gorn or force on the option for Western markets, by replacing the blood with what's supposed to be sweat. Dirty-minded players may mistake it for a fluid best left unmentioned here.
  • Awesome Art: The amount of detail in the sprites is unprecedented.
  • Awesome Music: In spades.
  • Breather Boss: Big John in Metal Slug 4.
  • Contested Sequel:
    • Metal Slug 3. A major point of contention is its length; some welcome the epic length of the game compared to other titles, but others feel that it succumbs to Ending Fatigue and as a result is very brutal in difficulty compared to other games.
    • Metal Slug 5. Either you love it for both introducing an entirely new set of enemies and (mostly) abandoning the more outlandish elements of the previous sequels, its rocking soundtrack, and its inventive level design, or you hate it for being an Obvious Beta that strays too far from the other games' aesthetic while trying too hard to be Darker and Edgier. The only real consensus is that it's better than 4.
  • Demonic Spiders: The zombie clones in the final level of Metal Slug 3. They take significantly more damage to kill than the regular clones and the blood vomit attack that was helpful to you when you were able to use it is a nightmare for you to dodge when they use it.
  • Dork Age: The Noise Factory era (who developed 4, 5, and Advance) is the point where opinions were widely split, specifically regarding the games' level design, mechanics, and the reuse of assets from previous games.
  • Ending Fatigue: Metal Slug 3. Mission 5 (of 5) goes on for an insanely long time, and in fact takes up half of the game. It could've been split up into several missions to lessen this trope.
  • Ensemble Darkhorse: Hyakutaro Ichimonji, who many fans consider the biggest badass of the series.
    • Allen O'Neal is fairly popular, mainly because of the Boss Banter.
    • Fio for other reasons.
    • The Mars People are one of the more popular enemy types (and one that's pretty recognizable even by non fans).
    • Nadia and Trevor have a fair bit of popularity for characters that are only playable in one game before Defense (and for being Suspiciously Similar Substitutes to Eri and Tarma).
    • The Drill Instructors. Their popularity, however, is extremely small compared to the other darkhorses above.
  • Fan-Preferred Couple: Due to the setup of the captured characters and their rescuers in Metal Slug 3 and Metal Slug 6, Marco/Fio and Tarma/Eri are mainly the "go to" couples (although any combination of the four are supported).
  • Fountain of Memes: The announcer, as seen below.
    • Also Allen O'Neal.
  • Game-Breaker:
    • Leona snaps Metal Slug XX like a twig.
    • Playing as Ralf on Easy in XX removes a large chunk of the challenge. Metal Slug 6's Easy Mode at least mitigated this by ending the game prematurely.
  • Good Bad Bugs:
    • The AES version of Metal Slug 5 had an un-dummied, incredibly easy-to-access debug menu which allowed to play any part of any stage on demand, plus a bunch of test areas full of free weapons, vehicles, unused stuff and a sprite/animation viewer.
    • Super Cancelling skips the cool-down animations. This is mostly used in Tool-Assisted Speedruns to increase the number of shots per second. However, Leona can use her Moon Slasher multiple times quickly by holding Up and the Special Button and alternating the shoot and grenade buttons. Use this against bosses and you're golden.
  • Growing the Beard: While the first game is still considered fun, it's the second game where the franchise really grew its legs and incorporated many of the Super Sentai-esque hallmarks of the series with the introduction of female player characters like Fio and Eri, more insane weapons and vehicles to use, transformations, and both supernatural and extraterrestrial enemies.
  • Memetic Mutation:
    • The announcer from X to Advance heard whenever weapons are picked up or the level is beaten.
      • RAWKET LAWNCHAIR!
      • SHAWTGUHN!
      • HEVEE MASHEEEN GUHN!
      • MISHOWN COMEPLEET *ending theme*
    • Allen O'Neal is no slouch in this department either.
      • C'mon, boy!
      • You're mincemeat!
      • See you in hell!
  • Moe:
    • The amount of blood spilled, flesh torn and bones crushed is usually proportional to the cuteness of your mech.
    • There's also Fio, the series' resident Moe character.
  • Most Wonderful Sound:
    • "You're great!" Gained from racking up a ton of points at the end of a level from rescuing a ton of POWs without dying and possibly clearing the mission with a Slug still intact.
    • "Mission Complete!" followed by the Mission Complete theme.
  • Narm Charm: The alternate Game Over screen you get when you complete the game.
    GAME OVER — PEACE FOREVER!
  • Nightmare Fuel:
    • Some of the concept illustrations for unused concepts are terrifying.
    • Admit it, you jumped a little upon first seeing the character select screen for Metal Slug 2 & 3.
    • A lot of the deaths are animated in disturbing detail; lighting people on fire in particular.
      • Special mention goes to the animation for when you get hit by a zombie's attack if you're already zombiefied, in 3's second level. It has the player character's head fall off.
    • Speaking of zombies, the special attack zombified players get: The zombified hero vomits up a horrifying amount of blood.
    • Are you claustrophobic? Do you hate bugs? Then be very careful which route you choose on Mission 4 in Metal Slug 3. If you decide to go there, then you'll be greeted by a lone, dead Rebel trapped within the vines.
    • Metal Slug 3D's final stage. Holy god it is a Womb Level with wet flesh everywhere. Just watch the cutscene after you beat the robot boss in the first part.
  • Porting Disaster: An interesting case in which any perfect-port of Metal Slug 2 is accused to be terrible due to its glaring slowdown issues while any other port that fixes the slowdown (such as the PC and Anthology ports) is considered superior.
  • Replacement Scrappy:
    • Trevor and Nadia, as they replaced series' regulars Tarma and Eri in Metal Slug 4. The latter two actually appear in order to justify stage transitions (they're driving the vehicles that pick you up at the end of every level), but that's just not enough.
    • The announcer of XX is considered to be unimpressive compared to the previous ones.
  • Scrappy Mechanic:
    • Each game gives you the option of sacrificing your vehicle in a powerful attack. Problem is, it's activated by pressing both the jump button and shoot button, the most used buttons in Metal Slug, at the same time. As a result, it's very possible to unintentionally throw away a vehicle loaded with powerful weaponry and capable of taking more punishment than the player character right when you need said vehicle the most. Arcade versions of the games from 4 onwards, reassigns this command to the D button, which is unlikely to be prone to the same mistake as earlier games don't use the D button. Many of the console ports of the games allow you to reassign any button, thus allowing you to prevent this as well.
    • Metal Slug 5 introduced a Mega Man-like slide move. Though it was useful at times, the problem with it was that it was activated by holding down and pressing jump. So most of the time when you wanted to jump and shoot downwards (a common tactic in this series to shoot things underneath you), you would slide instead, and probably die, or at least waste time. Thankfully, it was taken out of future installments. However, once Damn You, Muscle Memory! is overcome, the slide is an absolute blessing.
    • The "Metallish" combo system (where medals are given by shooting enemies and a fever time appears when collecting a special emblem) in Metal Slug 4 is regarded as very confusing, especially since the combo fever stops when a player goes into a Slug. It was revamped to a simpler combo system in 6 (where shooting enough enemies/obstacles will increase the score multiplier until coins spew out for a short time) and retained since then.
  • Scrappy Weapon:
    • Drop Shot fires bouncing explosives. While great for hitting enemies around obstacles, they move slowly and they suck for attacking enemies across a gap and enemies above you.
    • Stone is well... a stone. That doesn't even explode on impact.
    • Sniper rifle in 3D. Unlike some Third-Person Shooters, there's no real sniper mission throughout the game, and the gameplay is Nintendo Hard and you need quick reflexes. Plus, mooks can spawn here and there, making sniper rifles useless. Unless you can shoot precisely, the sniper rifle isn't a good way to clear a mission.
  • So Bad, It's Good: The game is very aware that it emulates trashy action movies from the '80s and the '90s, and the effort put into the storyline is either non-existent, or results in heavy dose of narm.
  • Squick: The zombies infect others (including the player characters) by vomiting/spraying infectious fluids on them. The scientist zombies in particular do so by pulling out their own intestines and squeezing them to expel the vomit.
  • Soundtrack Dissonance: The triumphant, heroic theme playing over the credits of the first game can come across as very jarring as the camera slowly pans over fields full of corpses and wreckages of tanks. Which you caused.
  • Suspiciously Similar Song:
    • The mission 3 music of Metal Slug 2 has a sax solo taken from the shooter Air Duel. The underwater theme of Metal Slug 3 is a remix of the stage 3 music of Air Duel.
    • The Desert theme from Metal Slug 3 bears more than an uncanny resemblance to Iron Maiden's Powerslave.
  • Tear Jerker: The ending of the first Metal Slug, which is notably less heavy on the wackiness than the sequels. As a paper airplane flies past the carnage you caused throughout the entire game with corpses everywhere, it flies past a girl praying at the grave of a rebel soldier.
    • Subverted with the 2-players ending, which shows most of the soldiers are still alive.
  • That One Boss:
    • Allen O'Neal from Metal Slug and Metal Slug 2/X. Yeah, this guy is extremely hard to defeat if you don't know how to predict his attacks. He can shot with his Machine Gun and if you try to move to the other side he just use a grenade towards you!
    • Sol Dae Rokker from Metal Slug 3. Its only weak point is the small red jewel in its forehead and due to the boss moving constantly it can be quite difficult to shoot. The boss also levitates way above the player, meaning that you can't harm it with grenades. Most of its attacks aren't a big deal, but That One Attack where it spreads a flurry of yellow beams in random patterns is a nightmare to dodge, specially after the boss is enraged.
    • The Sandmarine from Metal Slug 5. While most of its attacks are easy to avoid, when it submerges/emerges it will fire a bomb volley and make hell literally rain upon you. You need extremely good reflexes to avoid the bomb spam and don't get cornered by this monster.
    • The bosses of stages 3 and 4 of Metal Slug 6 are much more durable and nasty than the first two bosses were. Both take ridiculous amounts of punishment and have nigh-unavoidable attacks. Expect to use a lot of credits.
      • The stage 3 boss deserves even more special mention. Firstly: You're moving to your right, constantly, which means it feels awkward reaching around and shooting at the robot, not to mention the controls automatically face you to the right if you try to jump to the right to dodge something. This means it will take forever to kill it. Secondly: it keeps attacking, almost non-stop. And all of them are constant, even with the obvious pattern, so you'll be killed repeatedly. The "vulcan fix" skill is very useful here (hold down the shooting button to keep shooting in a fixed direction). Also, don't even try to take your time in defeating it, or it will get pissed and keep swinging his electrified arms reducing the safe zone to a ridiculous minimum!
    • Crablops round two in Metal Slug XX. While 7 was kind enough to lend you a Slug Armor to fight the boss, in XX it was changed to a Slugnoid - the only Slug that undergoes literal battle damage and more than likely will end up useless after a few seconds of battle, forcing you to fight Crablops stark naked. With the head spamming fireballs, plasma beams and restricting your movement with rocks, and the legs decreasing your maneuverable space by lauching bombs and acid worms, prepare for a hard battle. And that's not even taking into account when you get to the lift and Crablops Turns Red.
    • SNK Boss: You can count the final boss in Metal Slug 3D as a Final-Exam Boss because there are no powerups to collect, and you need fully-loaded weapons in order to defeat it.
  • That One Level:
    • The final mission of Metal Slug 3, which is the longest mission in the entire game.
      • To make things even worse, if you're playing on the Xbox port, you have limited continues, and if you use one, you'll start back all the way from the beginning.
    • 3D's final level is an entire Boss Bonanza of two Boss-Only Level and nothing else. No powerups to collect as well. Good luck fighting the SNK Boss in the second part.
    • The fourth mission of Metal Slug 6. More specifically, the beginning where multiple sets of Invaders start ambushing you from all sides.
  • Tough Act to Follow: Metal Slug 3 is often deemed as the best in the series and was the last game developed before SNK went bankrupt in 2000. The sequels since have been often compared unfavorably to it (even those created by SNK since their resurrection), especially 4 for recycling previous assets.
  • Ugly Cute: The Mars People. They're adorable, in a weird sorta way.
  • Villain Decay: Morden unfortunately goes the route of Dr. Eggman in later games, getting constantly upstaged by the real Big Bad until Metal Slug 7.

http://tvtropes.org/pmwiki/pmwiki.php/YMMV/MetalSlug