Anyone who complains about this book a) not having directions for every single model featured or b) using "too many weird pieces" has clearly missed the point. Sean's books (first Cool Cars and Trucks and now this one) have been lovingly and painstakingly designed in the spirit of the old LEGO idea books, where imagination was the order of the day.
The aim is not to have a thick tome of building instructions, but a book full of images and ideas that help inspire you to become a better builder. There are droids of all scales and shapes, ingenious uses of parts ("Even a trash bin can become a robot body"), and even some neat background models to help establish the robot world.
It's been a long time since LEGO has put out an official idea book, and they've even stopped including alternate model images on their set packaging. (Why? Because people whined about wanting the instructions for EVERY SINGLE THING.) Sean's books are a perfect heir to that throne -- and great for getting young (or adult) LEGO fans to start thinking about how to use those same old pieces in new ways.