Instruct: Classify Amazon reviews into positive or negative sentiment
Query: one of the worst written material on programming

I am not sure how I begin but, one of the lousiest written book about programming I've every read. It's totally disorganised; the writer doesn't seem to know his audience; beginners? intermediates? what exactly? He begins with really advance topics, but suddenly jumps into really basics that mostly don't require any kind of skills. This's like start teaching mathematics with advice and "tour" on, I don't know, differential equations but, suddenly talk about multiplication table. No organisation and certainly not good for anybody with any level of IT skills. Sorry!