
The main thing I liked is the tone; it's been a long time since I read something that could really be a children's story, and this had just the right amount of silliness mixed with seriousness to make it enjoyable. It made me feel the way I did when I read The Hobbit, and the few Tintin comics I got somehow. There is a lot of cutesy art and such, but it doesn't make it any less enjoyable.
I read the color version, and it was very pleasant to look at. I love that thick edge style for some reason too. Anyway, as for a summary of the plot, read just about any fantasy novel and you have the basic premise. There's a deposed queen, a fairy princess, dragons, epic battles, and quaint town-folk. Smith pokes fun at some of the more formulaic bits, which makes it a lot more fun. It isn't a simple story though, really; it gets pretty in-depth with lore and such. Really interesting stuff really.
Anyway, I highly recommend reading it. It's pretty long though.