Dirk Gently ... what can I say about Dirk Gently ... well, to be honest, I read this book only because it was written by Douglas Adams. As a huge fan of h2g2, I was expecting something awesome.
What I got was ... okay. Not awesome, perhaps great, definitely okay. There are aspects of Dirk Gently that I find appealing. I enjoyed the geometric conundrum of the sofa, and the Electric Monk, but found other parts a little too bizarre to be enjoyable.
Not that there's anything wrong with that, of course. We are talking about an author once affiliated with the Pythons, who are a shining example of how bizarre British humour can be (and don't love them for it). It doesn't necessarily work as well in a book.
So, I prefer h2g2 when I want to read something by Douglas Adams. Dirk Gently has its merits, but h2g2 feels more natural, more original, and just plain fun.