I had high expectations going into GK3... and I was not disappointed.  I'm a longtime adventure game fan, and it's been quite a while since I've played one of this calibre. I've always wanted the kind of total freedom  and interactivity the 3-D engine provides.  I hope Sierra is planning to  use it again.  Additionally, the storyline is first-rate and well plotted.  Gabriel and Grace are very human characters, and the way they relate to  each and develop was perhaps my favorite aspect of GK3.  Also, quite a  beautiful game.  If you love a good story, do buy it.