I just finished the game with 339 points.
Well... this is the third time i play gabriel knight and I still love it. Day 10 is a great conclusion. It has some fun puzzles (like summoning dr john) and a great ending.
Overall sins of the fathers is a masterpiece. Like Andrea said the game doesn't want to be an epic, like the other 2. This is the start of Gabriel's path as a Schattenjager and I don't think Jane could have done much better with the story.
Thank you Andrea for your insights on the game, which made me replay it again. A lot of thanks to all you guys too because playing a game like this is a lot funnier than playing alone and made me remembers the old times, when I used to play classics like Simon the Sorcerer with my friends over the phone.
Looking forward to GK2's playthrough