I hate:
When a game forces me to play the tutorial.
When a game forgets to tell the story while you're playing it, so it has to cram it all into lengthy cut scenes (Looking at you, end of Custom Robo, with your 45 minute dialogue scene).
Quick time events.
When the game has a full minute of unskippable company logos to watch before you can play it.
First person platforming.
Having one or more alternate endings with no option to save just before the pivotal choice.
Games with only one save slot.
Having to create an account somewhere to play the game.
When a horror game tries to creep me out with a baby crying or a little kid laughing. [Spoilers: IT'S NOT CREEPY, IT'S JUST STUPID]
No option to adjust gamma.
Beginners traps. (Anything that hurts the player unexpectedly that they couldn't have possibly prepared for if they've never played before)
Pay to win games.
When I want to buy something within a free-to-play game so I can support the devs, but I am forced to buy their own special currency so I eternally have 160 unused coins sitting in my account that I can't afford to buy anything with.
When graphics are highest priority and gameplay feels like a tacked-on afterthought.
The "I am Inigo Montoya, you killed my father, now prepare to die" storyline being repeated ad nauseum.
HUDs and characters that just don't shut the forget up and let me figure things out while I play. *Gazes longingly at Morrowind* You understood me. ;u;