Played the demo. It was decent. Although i wont be buying. It seems you cant die in it either. I allowed my health to get low and it just asked me to carry on from the exact spot i died at. I then did it later and it was the same. I thought "maybe you get continues" i died again. Nope. I checked options.
So basically there is no challenge.
"James Cameron does not do what James Cameron does for James Cameron... James Cameron does what James Cameron does because James Cameron IS James Cameron."