At least two out of the three games proved to be almost unplayable. I found it hard to believe that they were created in this millenium - they were that bad.
Unfortunately, I found Gothic a bit boring and could not be bothered with it, but that may be just because I had tried to play the other two games. Dungeon Lords was particularly poor. I have played dungeon keeper, Morrowind, Dragon Age and many other similar games and enjoyed them, but this was a real waste of money, despite being three games(although it may have been cheaper than buying Gothic by itself).
Gothic may be worth playing if you are prepared to invest more time into it, but I am currently playing with Kings Bounty and Torchlight, which are both a lot more fun and cost less :-)