My fav game. Here goes, I'll keep it short:

Things at first glance:
Pacing is amazing. Environments and the world have more vibe than anything I've ever experienced in a game. Gameplay grows deeper and deeper as you progress. Characters feel natural and a lot of them (look past the Tidus-hate, story-wise he is not the main character at all) have very mature character growth.

Deeper stuff:
The amount & depth of modern day themes this game handles is insane: racism, religion, indoctrination, ruling the masses by ignorance, death, war, value of life, mankind and it's right/wrong use of technology.

That said, I would even go that far to say this game is on the same page as 1984 is. SpoilerI think it's even better.

That's what makes this game time-less. It's a masterpiece. Literature. A reflection of issues in our world, presented in a way that is neutral while inviting you to make up your own mind.