The group thought that "Dirk Gently" was typical Douglas Adams fare: Witty, knowledgeable, quick on his feet, entertainingly random. A lot of our members had read the book a long time ago, and rediscovered it with joy. People remembered it very differently from their teenage or college years.
Some of us felt that it was of its time and that they had left that particular teen-age humour behind in their teens and weren't as entertained by the author now as they were then. We still appreciated his knowledge, especially about science. The stream-of-consciousness writing reminded us of Adams' stand-up comedy routine, similar to Spike Milligan or the TV show Red Dwarf - again, the humour is not for everyone!
The actual story of the book does have a plot line, a central mystery, but we all agreed that that is hardly the point of a Douglas Adams book. The characters are well drawn, and at times the writing is pleasingly straightforward as well and not exclusively comedic. A good read to immerse yourself in.