To me it was one of the best games I've ever played, and I've played quite few. The plot is really interesting, dialogs are good and voice acting is brilliant (Eng. version), especially Dr. Styles. Puzzles or not to hard and not too easy, just right. Did I say voice actors are great? They really are.
Loved the game so much I couldn't stop playing it until I finished it (well, I had to sleep and go to work).