At the time, my humor was more attuned to the slapstick type than the more dry British humor. I couldn't quite see the point of a depressed robot or figure out why someone would elect that person as president. As a member of the planet Earth at the time, and still, I didn't like the idea of being blown up to make room for a space highway.
I returned the book and had no interest of reading the follow-ups. Fast forward many years later, and my humor had advanced to the point where fart jokes weren't the honly things that brought tears to my eyes. I watched the movie and found it funny, so decided I would give the book another try. The second time around, I found the book much funnier and laughed out loud a few times.
It takes a certain type of sense of humor to appreciate the humor of Douglas Adams. It's certainly no where near sophisticated humor, but it's unique. I have sense read a couple more Douglas Adams books and each one has had the same type of humor. Sadly, Douglas Adams has passed on, but we are left with his legacy, beginning with The Hitchhiker's Guide To The Galaxy.