I've only ever read two other books by Terry Pratchett - Good Omens, which he cowrote with Neil Gaiman, and the first Discworld book, The Color of Magic. I really liked Omens, but at the time, I was all about Gaiman, so (because it was not entirely a Gaiman story) I didn't *love* it. And I didn't quite get Pratchett's humor when I read Color of Magic.
But, approaching this book, I was more receptive to the funny bits. This is (I think) partly because it's a Young Adult book, but it's also partly because of the Wee Free Men themselves - the Nac Mac Feegle. I mean, they help around the farm, like pixies, but they speak with a brogue, they wear kilts, and they're blue - they're not pixies, they're *pict-sies*! They're hilariously written, and they're a big part of why I enjoyed this book so much.