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Zelda: Ocarina of Time. The mandatory stealth sections ruin the game for me.

Chrono Trigger. The mandatory button mashing part, I would argue, ruins the game.

Hitman

The save system.

A lack of a manual save system. Worst thing any game can do. For those check point lovers, you don't HAVE to use it all the time.

[PROTOTYPE]
I can't fly away in a helicopter or jump in water.
It's like Just Cause on drugs.

Party Hard

God these cutscenes.

At least you can skip them.

I can think of several games ruined by the fact that you can't skip the cut scenes.

The Raven – Legacy of a Master Thief
Ruined by the atrocious, slow, infunctional controls.

Gabriel Knight: Sins of the Fathers – 20th anniversary edition
Ruined by the atrocious, slow, infunctional controls.

Flame in the Flood
One of the greatest atmospheres in games out there. But the truth is I actually hate roguelikes.

Valdis Story: Abyssal City
Loved it. Gave up. Too hard.

Deponia Doomsday
Daedalic sold it on a cover CD of the gaming mag of the sickest tabloid conglomerate in Germany at 9.99€ on day one. I can not forget. I can not forgive. And I certainly can't buy it at a higher price than those 9.99 €.

Metal Gear Solid 2 – Sons of Liberty
It was back then already when Kojima tried to tell the world in no uncertain terms that he can't write stories.

Advent Rising
Reproducible game breaking bug. And back then GOG didn't have a money back policy. One of the greatest game soundtracks, I have the CD, but no interest any more to play the game.

Earthlock - Festival of Magic
Great game, neat mechanics. Shit finale / plainly tedious final boss fight.

Saving is for pussies.

Mass Effect 3
1. Kai Leng **
2. That utterly ridiculous ending

I thought it was great that they paid hommage to Robocop 3 in Mass Effect 3. :p

"Otomo" and Kai Leng are virtually identical.

Zelda Breath of the Wild - motion control shrines
Zelda Breath of the Wild - rain. You can;t climb in the rain so you have to just stop and wait five minutes - literally - for the rain to end so Link can finish climbing a mountain or hill. And it rains all the f*cking time. I say 40 percent of the time it is raining in the game and I say 70 percent of the game is night time or rain. It is always dark in the world.

And wasting time replaying something you've already accomplished just to get to what actually killed you is for morons;)

It's the only game that has ever induced a 'rage quit' in me -- at the temple on Thessia.