I absolutely loved SoG, as did my husband. We loaned it to several friends, as well.
I do think SoG was a quick read -- I think I got through it in only a few hours. Not an easy read, but quick. I simply couldn't put it down. Fforde has an incredible way of leading you from one thought to the next without taking a breath. By the time you've gone halfway through the novel, you realize you haven't even changed out of your pajamas or taken a shower.
The universe is fascinating, and in a way reminded me of Flatland. I think the most fun I had in the book was trying to figure out all of the allusions. What was the Fallen Man? What was the Badly Drawn Map? Who was the Oz Memorial memorializing?
I've heard that the next in the series won't be out for a while yet -- which really makes me wish I hadn't read this book until the next two are out. The ending is a horrible cliffhanger.
I hope I never ridicule what is wise or good. Follies and nonsense, whims and inconsistencies do divert me, I own, and I laugh at them whenever I can.