Sorry your enjoyment didn't last, traveler. As I said, I understand where you're coming from. When I first played Secret Files: Tunguska, I expected a different game. I expected something to blow me away along the lines of TLJ and Syberia. When that didn't happen, when I heard Nina's speaking voice, the odd translations and noticed what I interpreted as general strangeness in the situations and puzzles, I was very disappointed.
However, when I went back to play the game again, something happened. I stopped expecting the game to be something other than it was, and I enjoyed it quite a bit more. What I had previously interpreted as flaws became endearing quirkiness. Maybe it helped that I played it with my fiance, and we started laughing over the lines and the situations. In that new light, when part 2 came out, I was really excited since I knew what to expect. I actually think they made improvements with the second game, although I missed the length and multiple locations of the first.
Of course, when Lost Horizon came out, I had a certain expectation and mindset for the game and did not expect to be blown away like I was. I think maybe the problem was you started with the best game first and worked your way backward.
Anyway, glad you are having fun with Jack Keane. That is certainly a very enjoyable game.
Hope you continue to have more fun with this one than SF2.