Instruct: Classify Amazon reviews into positive or negative sentiment
Query: wow

i was bit hesitant at first...ben stiller in a heavy role such as this? but i was utterly surprised and amazed. i'm a huge stiller fan to begin with, and my appreciation of his ability to act has grown ten-fold with this flick. the movie itself is disturbing, and will stay hauntingly with you days after you see it. stiller gives one of his bets performances yet, and truly has you feeling as if you're watching this story take place in real time...right before your very eyes. the soundtrack is great too...all in all, a great movie, but please note it is not for the faint at heart. it's a smack movie...lots of shootin up, but then again, it is based on the true life, needle experiences of jerry stahl. great movie....