Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Loved first third but then unsatisfying

I just loved everything about the first third of this hefty novel. It became disappointing when it dawned on me, that the author wouldn't be able to resolve all the clues and mysteries he'd laid out. The main protagonist started acting increasingly irrational too. I am also didn't particularly like the exceedingly graphic descriptions of war atrocities. It went on for too long too. I love serious fiction and I realize my opinion runs counter to the main stream, but that's the way I feel.