1 Having to grind experience for ludicrous lengths of time in order to get your characters' levels high enough to beat the final bosses of RPGs - Final Fantasy 4-6 and Secret Of Mana, among many others
Grinding is alright as long as it is either A: Reasonably short, or B: Rewarded with awesome random encounters that really help the player along (think of the Gold Slimes from Breath of Fire)
Final Fantasy VII as well, arguably - xandermartin98
2 Purposefully Stiff and Sluggish Controls - Resident Evil, Castlevania 1, etc.
3 Equipment Weight Management - Fallout 3
4 Claptrap - Borderlands
5 Navi - The Legend of Zelda: Ocarina of Time
Hey listen! Go find someone who actually cares about you!
Oh wait... No one does.
HEY LISTEN - BlueSheepYT
6 Characters literally NEVER shutting their mouths during fights - Xenoblade Chronicles
7 Fetch Quests - Cave Story
8 Francis - Super Paper Mario
9 Many of Eggman's boss fights - Sonic The Hedgehog series
10 Alphys and Toriel during the phone-calling-montage segments of the game - Undertale
11 Sonic - Sonic The Hedgehog
Whoever put sonic on the annoying things in good video games list Should die
12 Overabundance of clones in the character roster - Mario Kart 8, Super Smash Bros. Melee, etc
I hate the koopalings they serve no purpose,
13 Slippy Toad - Star Fox
14 Needlessly cryptic requirements for doing extremely important things - Final Fantasy VI, Cave Story, Legend of Zelda NES, Castlevania 2, etc
15 Memes - Super Smash Bros.
16 Aran Ryan - Punch-Out Wii
17 Scout - Team Fortress 2
18 Hadouken Spamming - Street Fighter
19 Unfairly Overpowered Characters - Super Smash Bros.
20 Hades - Kid Icarus Uprising
21 The Sans and Undyne boss fights from the Genocide run - Undertale
22 How pretentious it is - Cave Story, Mother 3, Undertale, Final Fantasy VII, etc
23 Xen - Half-Life
24 Helicopters and Striders - Half-Life 2
25 Surface Tension - Half-Life