I'm working my way through Atwood's The Year of the Flood. The interesting thing to look at is how she built her world.
On one hand, she explains very little. She tosses the reader right into the midst of rakunks and a post-apocalyptic world. It's not until much later that she explains about the genetic manipulation that created the menagerie of unusual critters. I haven't gotten to the explanation about the apocalypse yet, and I'm half way through the book. Atwood is confident enough to think you'll just go along for the ride, which is cool.
On the other hand, there's oodles of extra stuff. She includes sermons from one of the characters and religious hymns throughout. It adds texture. Or, it's intended to. At first, I read them. Now I skip them. For my money, I'm just not into it. But, then I'm reminded of something Neil Gaiman said about Fragile Things when people said they weren't into the poetry. To paraphrase, he said, "Don't think of it as a book of short stories and poetry. Think of it as a book of short stories with free poems added in." Based on my impression of Atwood, I think she'd be on the same page as Gaiman.
World building is such a fine balance. Do it right, and people get sucked in. Miss the mark, and...
So far, I'm kind of on the fence about The Year of the Flood. More commentary on that later.