If you have looked at the story deep enough, found all the radios, found all the writings. You will have a very deep game.
Just in case you were to dense to find everything, here's the main conspiricy (dunno if there are spoilers)
The game is based around the real-life conspiricy of the Annunnaki and the Ducaz. Supiror aliens who will return to earth in 2012 to re-slave earth. This theory is backed up by Planet X, a real life planet that was thrown from its star's orbit. And if you noticed, the game is set in 2012.
Adam's, no-one knows about him, but being older than 240 and the ending credits suggest something else.
The 'seeing is decieving' website supports the Annunnaki plot because if you decode the wallpaper, you get references to the drudge.
The levels are a bit linear, but at least you aren't wondering around in circles trying to find out where to go (as i watched my friend do for 30 minutes playing Halo)
The graphics are good for the wii. Bump maping, water with refraction and relection, and this is the tip of the engines iceberg. Also compare it to other wii games, dont compare it to xbox or ps3, basic journalistic skills.
I like the lack of vehicles, online you dont get some obessed teenager running you over every 10 seconds.
That review was poorley written, and dont say i hate Fred or whoever, as i have never heard of him and his crap ways of reviewing