djdarko: The consensus seems to be Gothic 2 is the best in the series.
But if you don't play the first one you miss a lot of continuity, and while 2 makes some improvements Gothic 1 is still very much worth playing.
But yeah since it's going off the site permanently grab 2, Personally I'd say forget about 3 but that's just my personal opinion, After all the patches it's at least a playable game and has attracted it's fans.
Forsaken Gods is pretty much terrible from what I've heard.
Be sure to check out Risen too.
As for Bugs, the gog Version of 1 & 2 have run perfectly for me.