* AssPull: Jason Chance as [[spoiler:Unit One]]. They don't even sound alike.
* AwesomeMusic: This is is just [[https://www.youtube.com/watch?v=S0tvc9IG9zQ one of many examples.]]
* EarWorm: The ThemeTune from the original UsefulNotes/PlayStation trilogy.
* GameBreaker:
** The air taser, wihout a doubt. Infinite range, infinite ammo, considered a stealth weapon, and can kill a helluva lot of baddies in relatively short time. Plus it's fun to hear them scream and see them catch on fire.
** In ''The Omega Strain'', the E.P.D.D., an advanced version of the air taser, is the best weapon in the game, as it has ridiculous range, and can sometimes punch through flak jackets (usually in two hits), meaning that you can kill almost ''anyone'' you come across.
* GoodBadBugs:
** In the last stage of ''Syphon Filter 3'', [[spoiler:Mara Aramov]] is hiding behind bulletproof glass with a hostage whom she kills if one gets too close. Normally you would need the gun that shoots through walls, get above her and snipe her through the floor. However, due to hardware limitations, the environment tends to get flushed out after a certain distance to save memory. This means that, if one keeps targeting [[spoiler:Mara]] and slowly backs away until the bulletproof glass panel poofs out of existence, a simple pistol can do the job.
** In ''The Omega Strain'', enemies will sometimes appear with weapons stuck in their necks, making it impossible to shoot the player, who can run around without fear of being hit. However, it can happen to the player as well.
* HarsherInHindsight: In ''2'', about halfway into the game, Lian Xing arranges a meeting with a former partner, Uri Gregorov, at a neutral meeting point: a techno dance club. But their meet-up is ruined by an attack on the club to try and assassinate Lian. And the date that this happens on in the mission dossier? ''09/11''.
** In ''3'', the first mission takes place in a Tokyo hotel called the ''"Fukushima'' Hotel". Surely a name chosen completely at random at the time, but carries a much darker association in the years since.
* ItsTheSameNowItSucks: A common complaint is that the original trilogy's barely changed over time, in both graphics and gameplay.
* MemeticMutation: Gabe's running animation in the first three games, due to how goofy it looks. Many like to think that he runs like that because he [[BringMyBrownPants didn't have enough time to get to the bathroom]].
* MostAnnoyingSound: Imani Gray when she's constantly yelling/whining at you in ''The Omega Strain'':
** "Cobra is down! I repeat, Cobra is down!"
** "You're runnin/almost outta time! PICK UP THE PACE!"
* NarmCharm: For some, the voice acting in the original [=PS1=] trilogy. The French version is even worse...or better.
* SuspiciouslySimilarSong: The song playing ''2''[='=]s Club 32 sounds like a techno version of [[Music/{{ABBA}} "Dancing Queen"]].
* ThatOneLevel:
** ''Syphon Filter'':
*** In the Washington Park level, you have to make precise silenced-night vision sniper shots at the tennis courts.
*** The Expo Center Reception level relies on evading or shooting multiple mooks.
*** In the Rhoemer’s Base level, you have to plant C4 on each of the base's fuel tanks while remaining unseen by the mooks.
*** The Base Tower level requires you to have enough ammo to fend off a helicopter whose pilot shoots automatic rounds at you.
*** The Rhoemer’s Stronghold, Stronghold Lower Level, and Stronghold Catacombs levels are sprawling. Fun to play, but extremely open world for its time.
*** The PHARCOM Warehouses level has infinite spawning mooks and a very confusing layout. Also, you have to use the infrared-style device to get what you need to advance, which are not at all easy to find, and you are not at all told that you needed to use them.
*** The Missile Silo level requires you to navigate a series of catwalks and metal beams to disarm the missile ''and'' escape before it launched.
** ''Syphon Filter 2'':
*** The New York Sewers level features narrow passages, almost no cover, and infinitely [[RespawningEnemies respawning]] Agency EliteMooks randomly appearing both in front and behind you.
** ''Syphon Filter 3'':
*** The Kabul, Afghanistan level features almost no cover, requiring you to protect both your teammate Ellis and the already damaged truck from rebels gunmen, grenadiers, and snipers.
** ''The Omega Strain'':
*** The bonus missions have you playing characters from the earlier games (Gabriel "Gabe" Logan, Teresa Lipan, Lawrence Mujari, etc.). Sounds cool, right? The problem is that these bonus missions can be quite long, have multiple objectives, are all stealth based, and if you get spotted, it's an instant game over. And because there are no checkpoints, if you fail, ''you have to start all over again from the beginning''.[[note]]Technically, you can still continue the game if you're spotted in Gabe's mission, but it's next to impossible to beat in the time limit you're given.[[/note]] This is especially problematic in Mujari's mission, where you have to sneak through a bombed-out village that has plenty of places for enemy soldiers to hide, and you can't kill any of them. The general consensus among ''Syphon Filter'' fans is that this is the most frustrating mission in the entire series.
* TheScrappy: Imani thinks she is [[Series/TwentyFour Jack Bauer]] but ends up being a lot bitchier, constantly harassing and putting down the player, [[spoiler: only to end up killed early in the game.]]