Gaiman takes on Thor, Loki, Odin, and the rest. Most of my knowledge of the Norse gods comes from Marvel Comics, with a bit of general cultural osmosis (for example, everyone has heard of Yggdrasil the World Tree, right?)1
I enjoyed it, but it feels like a slight work. That’s a shame, because these are mighty tales, or should be. I guess it’s a book meant at least partly for children, but it’s not marketed that way. And even if It’s meant for kids, the telling should be strong.
I suspect that if you already know the tales, this won’t offer much new to you. And that’s where the problem lies, I think. Instead of turning them into real narratives with proper characters, each story is not much more than a summary of the events. So he’s telling us the story of the story, rather than really telling (showing) the story. It’s a shame, because I know Gaiman could have done something much more interesting with these.
I’m probably being too harsh, though. It’s not like it’s bad. I enjoyed reading it.