Just this moment finished "Bioshock Infinite." Yes, it's as good as you've heard. Play. Play now.
At this point I've only got one immediate "clever" observation, but in the interest of not spoiling ANYTHING even vaguely or by accident I'll put it after the jump:
"Oh, you've got just ONE big-idea theoretical-scifi concept built into your narrative to justify the video-gamey parts of your video-game? That's really cute." - Bioshock Infinite, talking to the Assassin's Creed series.