Heh, well, Sanderson's novels aren't that long, well, not counting Stormlight Archive that is. Specially when you compare them to most books in fantasy genre.

As for Reacher novels, I haven't read many action / adventure / crime novels, but those that I have read haven't been very long, mostly around 300-400 page count, so Reacher's length was a surprise. If it was a fantasy book, wouldn't even have noticed it probably.