Gabriel Knight 1: sins of the fathers was the best game in the series. period.
The sequel that featured an interactive movie pleased me as well.
In the third one, you had to play one timeblock to another and this got me frustrated several times because I occasionally missed (overlooked) several items that consisted of a few unclear pixels in the revolutionary 3D world created.
Storyline was great, though could use a little more punch instead of platform action, especially in the end.