Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great cast but watch out for the ending!

I'm a big Robert Pattinson fan (even if I'm not a teen) and wanted to see another of his works. While it certainly doesn't having an upbeat tempo, he does a terrific job portraying such a brooding, damaged 21 year old student. The cast is amazing, especially the actress playing his younger sister, bringing a poignancy to a character in a difficult family situation.The ending, though, punched me in the gut. No big spoilers here but if your are sensitive to the coverage of 9/11, you might want to skip this movie.