I recently played through GK2 again this summer but I will definitely be picking up GK3 once it's on here.
A bit of help, I'm not sure if the gog version has this but when I played it this summer I found a nice patch/site which helped you play the game on xp (which I'd assume you won't need for gog) but also to take out the interlace lines in the FMV scenes which are a lot better.
http://gkpatches.vogons.zetafleet.com/
I love GK2, it has good acting especially by Peter Lucas and the woman who plays Grace in it. I felt Gabriel himself was a bit on the weak side in terms of acting (he just didn't fit right for me, going from the New Orleans style character voiced by Tim curry to this more "Ny/model" type of character.
(Maybe spoiler'ish below)
The story is decent and lots of good things, still it seemed rather strange to me that they use FMV for every character, then go to computer graphics for a wolf...which made it look out of place and not that scary imo, they really should have used real world costume/props a la American werewolf in london.