It's strange for me to see God of War in every other post here, that game felt like a generic action game and I was thinking how good were the first two games the whole time. There were no villages, towns, cities, almost the whole world consisted of strange corridors and platforms, and the worst thing is that you have to traverse back and forth like if the game world didn't feel small already. Then you are meeting the same two blacksmiths all the time - who are they making and selling their stuff to? Where are the people? I just couldn't believe in any of it and it all felt forced and uninspired. The central character is not Kratos or his son but a dude who can't feel anything - well I related to him a lot, the game didn't make me feel much. I know the old GoW formula was very tired but I would rather play that again.
Deus Ex (2000) - a game that pushes the boundaries of what the video game medium is capable of to a degree unmatched to this very day.