1 Set the gold standard for hilariously nonsensical and overcomplicated JRPG plots - Final Fantasy VII
2 Was meticulously tailor-made for the Social Justice Warrior community on Tumblr in literally every way possible - Undertale
Even though the game heavily makes FUN of Tumblr as well
3 Made violence levels basically the only thing that most of its players judged fighting games by - Mortal Kombat
Which, of course, is why Street Fighter got made fun of BY them
4 Had all of the most stereotypical elements of indie games: faux-retro art style, pompously pretentious storyline and amazing music to hide how weak the gameplay was - Cave Story
This also describes Undertale (at least in terms of its gameplay being relatively weak compared to most of its other aspects besides graphics)
5 Was deliberately scripted to be all but impossible to lose, even during boss fights - Super Metroid
6 Very openly encouraged rhythm games to take the full-on "style over substance" approach - Parappa The Rapper (and UmJammer Lammy to a lesser extent)
7 Introduced (weeb) furries into the gaming world - Sonic The Hedgehog and Star Fox
8 Forgot to include an in-game map and also completely butchered the aiming system, among other things - Metroid NES
(cough) the password system in the American version (cough)
9 Massively popularized the "hard for the sake of being hard" subculture of gaming - Castlevania and Mega Man
10 Introduced annoying helper characters into the Zelda franchise - Ocarina Of Time
The Contenders
11 Took Essentially All of the Skill Requirement Out of Castlevania - Symphony of the Night
There wasn't any skill requirement to even begin with. I had no problem beating Super Castlevania IV, and I'm probably one of the least skilled gamers I know.
12 Marked the Point When Resident Evil Pretty Much Stopped Caring About Actually Being Scary - Resident Evil 4
Up until 7, at least
13 Brought Sony's Ridiculous Over-Sexualization of Female Characters Into the Furry World - Crash Bandicoot and Umjammer Lammy
14 Prioritized Fancy Digitized Graphics Over Actual Gameplay - Mortal Kombat and Donkey Kong Country
Just because a game has good graphics doesn't mean that the graphics were prioritized over it. Donkey Kong Country is an extremely fun game.
15 Marked the Point at Which Mario Kart Went Essentially Full-On Luck-Based - Mario Kart: Double Dash!!
Mario Kart still skill-based
16 Was Probably the First Major Mario Title to Actually Prioritize Graphical Flashiness Over Its Actual Gameplay - Super Mario Galaxy
Thank gosh Super Mario Odyssey fixed that
17 Its Stupid "Rock, Paper, Scissors" Combat System - Pokémon Series
The Dinosaur king game is literally Rock, Paper, Scissors. At least in Pokemon you can attack with "not very effective" moves.
18 Popularized the Stupid "Collect-A-thon" Genre - Banjo-Kazooie and Super Mario 64
19 Linearized the Metroid Series - Metroid 2: Return of Samus
20 Marked the Point When Square Enix Games Started Going Full-On "Style Over Substance" - Final Fantasy Vi and Chrono Trigger
21 Set the Gold Standard for Cryptic Nonsense in Games - Indiana Jones: Raiders of the Lost Ark (Atari)
22 Was a First-Person Shooter that Was Really Just a Top-Down Shooter but Displayed from a Different Viewpoint - Doom (Original)
23 Turned Metroid Into a Forcedly Linear Mission-Based Game - Metroid Fusion
24 Implemented Checkpoint and Save Systems but Forgot How to Make Them Actually Work Properly - Crash Bandicoot
25 Had a Guitar Controller that Barely Worked at All and Was Also Stupidly Made Exclusive to the Game's Arcade Port - Umjammer Lammy