Greek mythology is a rewritten of old stories about Odin, Thor and Loki. It is entertainment enough as some of the stories seems new. It is old and from myths of the old days.
Neil Gaiman is a good storyteller. The only complaint is the stories are a bit disjoined.
Still very readable. Thor didn't have any character development as we get to know him in Marvel comics. the stories themselves are bounded by stories written before this.
Loki is much less likable as in the Marvel stories. His motivation is more like a sociopath than a witty and canning god.
Like it enough to finish it.