HHGTTG has always been what I thought was my biggest disconnect from geek culture. I read it in college (in '00, probably), and was pretty solidly bored throughout. To me, it was nothing more than a collection of absurdities and non-sequiturs strung into a ungripping narrative. I'd describe it as a trite version of Vonnegut or Heller, but without any of the soul.
I've never really understood the appeal. I won't assert that it sucks, but it sure isn't on my wavelength.
That said, I can't believe they would actually try giving this to another writer. This fanbase is too... fickle? smart? discerning?