I remember back when I first played Far Cry a similar feeling that it was pleasant in a way just to have a virtual environment like that. I just replayed it about a month ago, and the thrill was gone.
It's a pretty good shooter, but as most shooters it gets by on contrivance and convention. That's not to call that a failure. It can be intellectually and viscerally satisfying to deal with those challenges in fresh environments, but once the depth of substance and story are laid bare, there just is not a lot left for me after going for the ride once.