Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bad coding style, poorly organized, good information

The sample code uses variable names very poorly. You constantly have to verify what types of object instances they represent, and whether or not they are pointers. You cannot just read the text without the sample code. In fact the samples only loosely adhere to the chapter contents. But with extra effort you can piece the general disorganization together and gain some benefit.