A quick word on some favorites
First off, there are no (and never will be) perfect games. It is not possible to say which game is the ‘best’ as the question itself is pretty much meaningless. A more appropriate question would be which game is the ‘Best’ in a certain aspect, and even that is subjective to the individual. Even of my own opinion it is difficult to say what I believe to be the ‘best’ game, or even my favorite game.
If however, someone were to put a gun to my head and ask such a silly question, I would say it is a tie between Deus Ex and Final Fantasy VII. If then forced to choose between those two then I would probably be dead before I heard the shot. My fondness for both prevents me from making a decision. Both are large in scope, have complex stories, different ways to play, great music, action and effectively provoke emotion. Neither have aged well and when I revisit them I notice more and more flaws, but I will forever remember these with rose tinted glasses. I played them at just the most appropriate moments in my life for them to have the biggest impact and they will not soon be forgotten.