Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A very good book, but...

Like almost all of military historians, professor Kennedy sometimes thinks all that happens in the world is due to militar power. Sometimes his analysis has flaws that we can clearly detect. Apart from the critics, it is also awesome that someone nowadays sits down to write the history of the world since 1500! That's something great, and we're lacking people who does that. It is definetely a book worth reading.