Knowing the Edda and Nordic Mythology in general a little, there wasn't much "new" to be learnt here. But still this was an interesting book for me, for various reasons.

One reason is the quality of the retelling: Gaiman managed to combine passages reminiscent of the tone of the "original" Edda with "modern" parts suited to present-day-readers without previous knowledge of the less omnipresent Nordic myths.
Another, of course, is the humour he put in. Not that the original myths are humourless, largely thanks to Loki - but there is also a bit of Gaiman humour in there now.
And lastly, I was glad about the revisiting of this mythological area in general, in such an accessible way, because of all the fantasy literature I read. It is very interesting to be reminded how many writers draw from the Nordic myths quite freely, not least and recently prominent George R. R. Martin for his Westeros.

I was very happy with this book, though readers should bear in mind that this isn't a novel, but a collection of stories of Northern Gods.