well, time to write the formal review for this biggie (500,000+ ratings). I admit I'm a little reluctant to start rating/reviewing the series, as it is a cult classic, soon the landing page for Goodreads will be full of updates on the discussion forums for this series.
anyway... how to say... "absurdist" "surrealist" "psycho-Science fiction" "British humour" "Dr. Who meets Red Dwarf meets Raving Lunatics Party?"
an underlying ethos runs through the Hitchhiker's Guide series, and here, in the perhaps obviously written "first entry" (the book ends on a clear , 'more to come' note), is the beginning of a humor saga from then 27-year old radio producer Douglas Adams. the Kurt Vonnegut influence is obvious, but in many ways exceeding the prior master, more unified, more witty, more quick-paced.
well, this is a timeless classic.