What is this game, and how did I overlook it? It's a new stealth game exclusively for the 360 and apparently its receiving wide acclaim

Look identical in gameplay to Assassins Creed DS

I played the demo. Pretty fun, but very simple, and not in the effective way. Unless there's a lot more to the game (other tools and such) I can't help but think it'd be pretty formulaic throughout.

Seems interesting, if not a bit boring and tedious. I'm not really sure what the story is, but it seems like it follows the "vengeance" story line of every other Ninja/Assassin game. Doesn't really look like my cup of tea to be honest.