The Last of Us, not because the game is bad. The game is really good, but my mind just can't comprehend why the ending should even work. I get why it works in theory but in practise it comes off as a bizarre epilogue and more importantly we're supposed to be all happy for characters that have just committed one of the worst crimes you could possibly commit in that setting.
But if we must discuss a full game. Well BioShock Infinite did that for me. I bought Infinite, Remember Me and BioShock 1 all together and gleefully played through 1 after RM. While 1 was great, Infinite kept dancing on the knife's edge between "this is good" and "I don't like this". If you can guess, it fell onto the "I don't like this", and every thought I've given it since has worsened my opinion.
I love the art style, but that's undercut by the violence. The world is violent and it fits in with the story, but the violence is utterly wasted on everyone being a cartoon. There's no impact in making a cartoon explode into bits or incinerate them by electrical fire. BioShock 1 managed to make the world violent with the aesthetic and making the story and atmosphere grim. Infinite is an adventure which is trying to tell a violent story but it felt more like Indiana Jones but animated and in a more racist setting in terms of visuals.
The shooting is alright, but that's undercut by the shooting being an even more dumbed down version of BioShock 1's shooting. The health system is also just completely stolen from Halo: Combat Evolved but about fifty times easier because H:CE didn't have an invincible companion throw you ammo, health and money whenever she felt like it.
The game tries to make Elizabeth a sympathetic character, but she's just as kill crazy as anybody else, and the final thing she kills in the game before the ending is one of the most brutal ways I've ever seen anybody die in a video game. Yet we're supposed to think that what she did was a good thing to do, and her whispers are signs that I shouldn't be anywhere near this crazy person.
Booker is supposed to be unlikeable but I didn't have any reaction to him. He's just so boring and he "oh woah is me" act is tiresome.
The final level is shit, but in a different way to BioShock 1's. At least BioShock 1 was a challenge rather than a "wait until the game says it's over" shitty tower defence mission.
And yet, I don't think I should be this annoyed at Infinite as I should be. I mean, it's not that bad from an actual quality stand point. Same for The Last of Us' ending. It fits the characters and concludes their arcs, but I'm extremely pissed because we're supposed to see them as human and be happy for them. In fact that's the main reason I take a disliking to the ending. Everyone said that the game is supposed to showing the Humans as monsters when it doesn't. It shows them as flawed Humans, and tries to make us sympathise with them. That theme continues into the ending.