[Karacan]

Gothic is brilliant. Both parts are absolutely playworthy, though all in all I find the first part more atmospheric, while the second part was better balanced. They're both incredible playable.

For a great story, check out Anachronox - while the arcade interludes and the Final Fantasy combatsystem isn't exactly my preferred medium, the story is fantastic and always makes me weep that the publisher went broke and there won't be a sequel.

If you haven't done so yet, play System Shock 2. This is the FPS/roleplaying-hybrid where both parts are incredible well executed. I just started playing it again with two friends of mine, and the three character classes definitely play very differently as they advance.

For the "I don't care about graphics at all"-crowd, there's Spiderweb's Avernum series. Very good stories, and Avernum III is huge.