Good Omens is a fantastic book in multiple subtle ways. The start felt somehow hasty – or something, it's hard to describe.
There was something about the pace of the story that I found difficult to settle to at first, but then story sucked me in and I wasn't thinking anymore, I was just reading and enjoying it.

The topic of the book is interesting and addressed in an original way. There is brilliant, on-point commentary about the world, humans and religion – things like "terrorists who fight on Heaven's side are called freedom fighters". Absolutely priceless stuff. Gaiman's darkness and Pratchett's humour are an excellent combination, though the mix is something more than the sum of its parts. The book is full of tiny jokes like a place in Japan called Nigirizushi. Not many books make me laugh out loud, but this one did.

The characters are interesting and funny from the beginning. I especially liked the Angel of Death, Crowley and Aziraphale very much, but all the characters are good.

As a bonus, the edition I read also came with an attached bookmark. This should be a default in all books!!