The Colour of Magic text adventure was crap, for sure!
As for the Hitchhiker's Guide text adventure, it was my first encounter with Douglas Adams' writings, so in that way it was brilliant (made me read the books), and it was quite funny as well (-ing difficult, though).
BTW, Jason...I knew I recognized your name from somewhere - I've been receiving Discworld Monthly for some time now. Brilliant stuff!
Stercus, stercus, stercus, moriturus sum!