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-mindeded players may mistake it for a fluid best left unmentioned here.
  • Awesome Art: The amount of detail put into the sprites is very impressive.
  • Awesome Music: In spades.
  • 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.
  • 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 Bad Ass 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 has a fair bit of popularity for somebody that's only playable in one game to date (and for someone who's a Suspiciously Similar Substitute).
  • Fountain of Memes: The announcer, as seen below.
    • Also Allen O'Neal.
  • Freud Was Right: Take a look at where the Slug Gigant's gun is located at. For added bonus, its shots come out rapidly in a gravity-determined arc, making it look like its pissing.
  • Game Breaker: Leona snaps Metal Slug XX like a twig.
  • 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.
  • 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 hallmarks of the series with the introduction of Fio and Eri, more insane weapons and vehicles to use, transformations, and both supernatural and extraterrestrial enemies.
  • Memetic Mutation: Narm plus Funetik Aksent equals the Metal Slug announcer.
    • 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 PO Ws 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 art 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. You may want to avoid lighting people on fire.
      • 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.
  • 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.
  • 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, probably 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. 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.
    • 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 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. But once Damn You, Muscle Memory is overcome, the slide is an absolute blessing.
  • 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.
  • So Cool It's Awesome: The entire series, even though the games are very difficult.
  • Squick: The zombies infect others (including the player characters) by vomiting/spraying infectious fluids on them.
  • 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.
  • That One Boss:
    • 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 special SPECIAL mention. Holy fark, that robot... First: 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!
    • 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 all of 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.
  • They Just Didn't Care: On the official soundtrack for Metal Slug 4, several of the songs are given the wrong names and played out of order. In earlier copies of the actual game, the final boss's theme was switched with his intro theme.
  • 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.