Humour is very personal and subjective. Never feel bad if a series doesn't hit you like it hits others.

When it comes to the HHGTTG trilogy, the books are in order of quality. The first is the best, second is second best, third is third best, fourth is fourth best, and the fifth one was mostly written because he wanted to destroy any request to make sequels and he destroys all realities at the end of it.

I love the series, but f the first one doesn't grab you, it isn't worth continuing.